diff --git a/client/src/components/cost-analysis/StoreTab.tsx b/client/src/components/cost-analysis/StoreTab.tsx
index 3179955..28eb3d2 100644
--- a/client/src/components/cost-analysis/StoreTab.tsx
+++ b/client/src/components/cost-analysis/StoreTab.tsx
@@ -8,6 +8,7 @@ import { Pagination } from '@/components/Pagination'
 import { formatCurrency, formatPercent, formatNumber } from '@/lib/utils'
 import { useState } from 'react'
 import { PieChart, Pie, Cell, Tooltip, ResponsiveContainer } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const PAGE_SIZE = 15
 const LEVEL_COLORS: Record<string, string> = {
@@ -22,9 +23,10 @@ export function StoreTab() {
   const [sort, setSort] = useState('food_cost_variance')
   const [order, setOrder] = useState('desc')
   const [filter, setFilter] = useState('')
+  const [month, setMonth] = useState('2026-04')
 
-  const { data: ov, isLoading: l1 } = useQuery({ queryKey: ['ca/store-overview'], queryFn: () => api.get('/cost-analysis/store-overview') })
-  const { data: ranking, isLoading: l2 } = useQuery({ queryKey: ['ca/store-ranking', page, sort, order, filter], queryFn: () => api.get(`/cost-analysis/store-ranking?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&order=${order}&filter=${filter}`) })
+  const { data: ov, isLoading: l1 } = useQuery({ queryKey: ['ca/store-overview', month], queryFn: () => api.get('/cost-analysis/store-overview', { params: { month } }) })
+  const { data: ranking, isLoading: l2 } = useQuery({ queryKey: ['ca/store-ranking', month, page, sort, order, filter], queryFn: () => api.get(`/cost-analysis/store-ranking?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&order=${order}&filter=${filter}&month=${month}`) })
 
   if (l1 || l2) return <LoadingSpinner text="加载门店成本数据..." />
 
@@ -48,6 +50,9 @@ export function StoreTab() {
 
   return (
     <div className="space-y-4">
+      <div className="flex items-center justify-end">
+        <MonthPicker month={month} onChange={setMonth} />
+      </div>
       <div className="grid grid-cols-2 gap-3 md:grid-cols-3">
         <MetricCard title="门店总数" value={ovData.total_stores} format="number" />
         <MetricCard title="红色-严重超耗" value={ovData.red_count} format="number" />
diff --git a/client/src/components/store-expense/BreakEvenTab.tsx b/client/src/components/store-expense/BreakEvenTab.tsx
index 68d3802..fc1d534 100644
--- a/client/src/components/store-expense/BreakEvenTab.tsx
+++ b/client/src/components/store-expense/BreakEvenTab.tsx
@@ -17,12 +17,12 @@ const SAFETY_COLORS: Record<string, string> = {
   '安全边际充足': 'text-green-600',
 }
 
-export function BreakEvenTab() {
+export function BreakEvenTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('safety_margin_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('asc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/break-even', page, sort, filter, order], queryFn: () => api.get(`/store-expense/break-even?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/break-even', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/break-even?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载盈亏平衡分析..." />
 
diff --git a/client/src/components/store-expense/ContributionTab.tsx b/client/src/components/store-expense/ContributionTab.tsx
index 34652f8..da212bb 100644
--- a/client/src/components/store-expense/ContributionTab.tsx
+++ b/client/src/components/store-expense/ContributionTab.tsx
@@ -9,12 +9,12 @@ import { formatCurrency, formatPercent } from '@/lib/utils'
 
 const PAGE_SIZE = 20
 
-export function ContributionTab() {
+export function ContributionTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('actual_store_contribution_rate_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('asc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/contribution', page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-contribution?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/contribution', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-contribution?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载门店贡献利润..." />
 
diff --git a/client/src/components/store-expense/DeliveryTab.tsx b/client/src/components/store-expense/DeliveryTab.tsx
index 2c83525..85426c1 100644
--- a/client/src/components/store-expense/DeliveryTab.tsx
+++ b/client/src/components/store-expense/DeliveryTab.tsx
@@ -9,12 +9,12 @@ import { formatCurrency, formatPercent } from '@/lib/utils'
 
 const PAGE_SIZE = 20
 
-export function DeliveryTab() {
+export function DeliveryTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('commission_to_delivery_sales_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('desc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/delivery', page, sort, filter, order], queryFn: () => api.get(`/store-expense/delivery-commission?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/delivery', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/delivery-commission?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载外卖佣金分析..." />
 
diff --git a/client/src/components/store-expense/EfficiencyTab.tsx b/client/src/components/store-expense/EfficiencyTab.tsx
index f7f6a45..03ccb24 100644
--- a/client/src/components/store-expense/EfficiencyTab.tsx
+++ b/client/src/components/store-expense/EfficiencyTab.tsx
@@ -9,12 +9,12 @@ import { formatCurrency, formatPercent, formatNumber } from '@/lib/utils'
 
 const PAGE_SIZE = 20
 
-export function EfficiencyTab() {
+export function EfficiencyTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('received_per_sqm')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('desc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/efficiency', page, sort, filter, order], queryFn: () => api.get(`/store-expense/efficiency?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/efficiency', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/efficiency?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载人效坪效数据..." />
 
diff --git a/client/src/components/store-expense/ExpenseOverviewTab.tsx b/client/src/components/store-expense/ExpenseOverviewTab.tsx
index 8ff2bfc..d4306a6 100644
--- a/client/src/components/store-expense/ExpenseOverviewTab.tsx
+++ b/client/src/components/store-expense/ExpenseOverviewTab.tsx
@@ -8,9 +8,9 @@ import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContaine
 
 const PIE_COLORS = ['#3b82f6', '#ef4444', '#22c55e', '#f97316', '#eab308', '#8b5cf6', '#06b6d4', '#ec4899', '#84cc16', '#a3a3a3', '#f43f5e', '#6366f1', '#14b8a6', '#facc15', '#7c3aed', '#10b981', '#fb923c']
 
-export function ExpenseOverviewTab() {
-  const { data: overview, isLoading: l1 } = useQuery({ queryKey: ['se/overview'], queryFn: () => api.get('/store-expense/overview') })
-  const { data: structure, isLoading: l2 } = useQuery({ queryKey: ['se/structure'], queryFn: () => api.get('/store-expense/expense-structure') })
+export function ExpenseOverviewTab({ month }: { month: string }) {
+  const { data: overview, isLoading: l1 } = useQuery({ queryKey: ['se/overview', month], queryFn: () => api.get('/store-expense/overview', { params: { month } }) })
+  const { data: structure, isLoading: l2 } = useQuery({ queryKey: ['se/structure', month], queryFn: () => api.get('/store-expense/expense-structure', { params: { month } }) })
 
   if (l1 || l2) return <LoadingSpinner text="加载费用总览..." />
 
diff --git a/client/src/components/store-expense/FixedVariableTab.tsx b/client/src/components/store-expense/FixedVariableTab.tsx
index 93d5e63..1426a1b 100644
--- a/client/src/components/store-expense/FixedVariableTab.tsx
+++ b/client/src/components/store-expense/FixedVariableTab.tsx
@@ -9,12 +9,12 @@ import { formatCurrency, formatPercent } from '@/lib/utils'
 
 const PAGE_SIZE = 20
 
-export function FixedVariableTab() {
+export function FixedVariableTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('fixed_rate_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('desc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/fixed-variable', page, sort, filter, order], queryFn: () => api.get(`/store-expense/fixed-variable?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/fixed-variable', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/fixed-variable?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载固定/变动费用拆分..." />
 
diff --git a/client/src/components/store-expense/LossDiagnosisTab.tsx b/client/src/components/store-expense/LossDiagnosisTab.tsx
index 34c396e..b9e8cdf 100644
--- a/client/src/components/store-expense/LossDiagnosisTab.tsx
+++ b/client/src/components/store-expense/LossDiagnosisTab.tsx
@@ -185,13 +185,13 @@ function StoreDetailModal({ store, onClose }: { store: StoreDetail | null, onClo
   )
 }
 
-export function LossDiagnosisTab() {
+export function LossDiagnosisTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('actual_store_contribution')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('asc')
   const [selectedStore, setSelectedStore] = useState<StoreDetail | null>(null)
-  const { data, isLoading } = useQuery({ queryKey: ['se/loss-diagnosis', page, sort, filter, order], queryFn: () => api.get(`/store-expense/loss-diagnosis?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/loss-diagnosis', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/loss-diagnosis?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载亏损门店诊断..." />
 
diff --git a/client/src/components/store-expense/RentRiskTab.tsx b/client/src/components/store-expense/RentRiskTab.tsx
index 5e7e9b6..6b2e231 100644
--- a/client/src/components/store-expense/RentRiskTab.tsx
+++ b/client/src/components/store-expense/RentRiskTab.tsx
@@ -17,13 +17,13 @@ const RISK_COLORS: Record<string, string> = {
   '正常': '',
 }
 
-export function RentRiskTab() {
+export function RentRiskTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('rent_rate_pct')
   const [filter, setFilter] = useState('')
   const [riskOnly, setRiskOnly] = useState(false)
   const [order, setOrder] = useState('desc')
-  const { data, isLoading } = useQuery({ queryKey: ['se/rent', page, sort, filter, riskOnly, order], queryFn: () => api.get(`/store-expense/rent-risk?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&risk_only=${riskOnly}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/rent', month, page, sort, filter, riskOnly, order], queryFn: () => api.get(`/store-expense/rent-risk?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&risk_only=${riskOnly}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载房租及租约风险..." />
 
diff --git a/client/src/components/store-expense/StoreEvaluationTab.tsx b/client/src/components/store-expense/StoreEvaluationTab.tsx
index b2b60a9..50107f3 100644
--- a/client/src/components/store-expense/StoreEvaluationTab.tsx
+++ b/client/src/components/store-expense/StoreEvaluationTab.tsx
@@ -107,13 +107,13 @@ function EvalDetailModal({ store, onClose }: { store: EvalStoreDetail | null, on
   )
 }
 
-export function StoreEvaluationTab() {
+export function StoreEvaluationTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('actual_store_contribution_rate_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('asc')
   const [selectedStore, setSelectedStore] = useState<EvalStoreDetail | null>(null)
-  const { data, isLoading } = useQuery({ queryKey: ['se/evaluation', page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-evaluation?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/evaluation', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-evaluation?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载门店评估..." />
 
diff --git a/client/src/components/store-expense/StoreRankingTab.tsx b/client/src/components/store-expense/StoreRankingTab.tsx
index 662c85e..50d12ac 100644
--- a/client/src/components/store-expense/StoreRankingTab.tsx
+++ b/client/src/components/store-expense/StoreRankingTab.tsx
@@ -9,13 +9,13 @@ import { formatCurrency, formatPercent, formatNumber } from '@/lib/utils'
 
 const PAGE_SIZE = 20
 
-export function StoreRankingTab() {
+export function StoreRankingTab({ month }: { month: string }) {
   const [page, setPage] = useState(1)
   const [sort, setSort] = useState('operating_expense_rate_pct')
   const [filter, setFilter] = useState('')
   const [order, setOrder] = useState('desc')
 
-  const { data, isLoading } = useQuery({ queryKey: ['se/ranking', page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-ranking?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}`) })
+  const { data, isLoading } = useQuery({ queryKey: ['se/ranking', month, page, sort, filter, order], queryFn: () => api.get(`/store-expense/store-ranking?page=${page}&page_size=${PAGE_SIZE}&sort=${sort}&filter=${filter}&order=${order}&month=${month}`) })
 
   if (isLoading) return <LoadingSpinner text="加载门店费用率排名..." />
 
diff --git a/client/src/pages/CostPage.tsx b/client/src/pages/CostPage.tsx
index 9c1ecf7..dc8b140 100644
--- a/client/src/pages/CostPage.tsx
+++ b/client/src/pages/CostPage.tsx
@@ -9,6 +9,7 @@ import { Badge } from '@/components/Badge'
 import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState, useMemo } from 'react'
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, ScatterChart, Scatter } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const PAGE_SIZE = 15
 
@@ -16,20 +17,21 @@ export function CostPage() {
   const [costPage, setCostPage] = useState(1)
   const [invPage, setInvPage] = useState(1)
   const [catPage, setCatPage] = useState(1)
+  const [month, setMonth] = useState('2026-04')
 
   const { data: costData, isLoading: costLoading } = useQuery({
-    queryKey: ['cost/comparison'],
-    queryFn: () => api.get('/cost/comparison'),
+    queryKey: ['cost/comparison', month],
+    queryFn: () => api.get('/cost/comparison', { params: { month } }),
   })
 
   const { data: invData, isLoading: invLoading } = useQuery({
-    queryKey: ['cost/inventory'],
-    queryFn: () => api.get('/cost/inventory'),
+    queryKey: ['cost/inventory', month],
+    queryFn: () => api.get('/cost/inventory', { params: { month } }),
   })
 
   const { data: catData, isLoading: catLoading } = useQuery({
-    queryKey: ['cost/category-benchmark'],
-    queryFn: () => api.get('/cost/category-benchmark'),
+    queryKey: ['cost/category-benchmark', month],
+    queryFn: () => api.get('/cost/category-benchmark', { params: { month } }),
   })
 
   const costRows = (costData as any)?.data || []
@@ -67,9 +69,12 @@ export function CostPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">成本与库存管理</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">理论vs实际成本 · 原料分类差异 · 库存效率 · 2026年4月</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">成本与库存管理</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">理论vs实际成本 · 原料分类差异 · 库存效率 · {month}</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 概览指标 */}
diff --git a/client/src/pages/DataQualityPage.tsx b/client/src/pages/DataQualityPage.tsx
index af65177..d9a661d 100644
--- a/client/src/pages/DataQualityPage.tsx
+++ b/client/src/pages/DataQualityPage.tsx
@@ -4,11 +4,14 @@ import { LoadingSpinner } from '@/components/LoadingSpinner'
 import { CollapsibleSection } from '@/components/CollapsibleSection'
 import { MetricCard } from '@/components/MetricCard'
 import { formatNumber, formatCurrency } from '@/lib/utils'
+import { useState } from 'react'
+import { MonthPicker } from '@/components/MonthPicker'
 
 export function DataQualityPage() {
+  const [month, setMonth] = useState('2026-04')
   const { data: qualityData, isLoading } = useQuery({
-    queryKey: ['data-quality'],
-    queryFn: () => api.get('/data-quality'),
+    queryKey: ['data-quality', month],
+    queryFn: () => api.get('/data-quality', { params: { month } }),
   })
 
   const dq = (qualityData as any)?.data || {}
@@ -45,9 +48,12 @@ export function DataQualityPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">数据质量看板</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">账单与菜品明细数据质量检查 · {dq.min_date?.substring(0, 10)} ~ {dq.max_date?.substring(0, 10)}</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">数据质量看板</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">账单与菜品明细数据质量检查 · {dq.min_date?.substring(0, 10)} ~ {dq.max_date?.substring(0, 10)}</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 质量状态总览 */}
diff --git a/client/src/pages/MemberPage.tsx b/client/src/pages/MemberPage.tsx
index 48ceab2..12e9fa4 100644
--- a/client/src/pages/MemberPage.tsx
+++ b/client/src/pages/MemberPage.tsx
@@ -8,11 +8,13 @@ import { MetricCard } from '@/components/MetricCard'
 import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState, useMemo } from 'react'
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer, PieChart, Pie, Cell } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const PAGE_SIZE = 15
 
 export function MemberPage() {
   const [repeatPage, setRepeatPage] = useState(1)
+  const [month, setMonth] = useState('2026-04')
 
   const { data: comparisonData, isLoading: cmpLoading } = useQuery({
     queryKey: ['member/comparison'],
@@ -20,8 +22,8 @@ export function MemberPage() {
   })
 
   const { data: repeatData, isLoading: repeatLoading } = useQuery({
-    queryKey: ['member/repeat'],
-    queryFn: () => api.get('/member/repeat'),
+    queryKey: ['member/repeat', month],
+    queryFn: () => api.get('/member/repeat', { params: { month } }),
   })
 
   const cmpRows = (comparisonData as any)?.data || []
@@ -66,9 +68,12 @@ export function MemberPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">会员与复购管理</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">会员对比 · 复购率 · 沉睡分析 · 2026年4月</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">会员与复购管理</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">会员对比 · 复购率 · 沉睡分析 · {month}</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 概览指标 */}
diff --git a/client/src/pages/PlatformPage.tsx b/client/src/pages/PlatformPage.tsx
index a3e0c92..bee1b1a 100644
--- a/client/src/pages/PlatformPage.tsx
+++ b/client/src/pages/PlatformPage.tsx
@@ -8,16 +8,18 @@ import { MetricCard } from '@/components/MetricCard'
 import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState, useMemo } from 'react'
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const PAGE_SIZE = 15
 
 export function PlatformPage() {
   const [platformPage, setPlatformPage] = useState(1)
   const [marketingPage, setMarketingPage] = useState(1)
+  const [month, setMonth] = useState('2026-04')
 
   const { data: platformData, isLoading: platformLoading } = useQuery({
-    queryKey: ['platform/economics'],
-    queryFn: () => api.get('/platform/economics'),
+    queryKey: ['platform/economics', month],
+    queryFn: () => api.get('/platform/economics', { params: { month } }),
   })
 
   const { data: marketingData, isLoading: marketingLoading } = useQuery({
@@ -63,9 +65,12 @@ export function PlatformPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">平台与优惠管理</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">三平台经济性 · 营销方案ROI · 优惠结构 · 2026年4月</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">平台与优惠管理</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">三平台经济性 · 营销方案ROI · 优惠结构 · {month}</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 概览指标 */}
diff --git a/client/src/pages/SKUPage.tsx b/client/src/pages/SKUPage.tsx
index 336667c..f132c21 100644
--- a/client/src/pages/SKUPage.tsx
+++ b/client/src/pages/SKUPage.tsx
@@ -8,6 +8,7 @@ import { MetricCard } from '@/components/MetricCard'
 import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState, useMemo } from 'react'
 import { PieChart, Pie, Cell, Tooltip, Legend, ResponsiveContainer, BarChart, Bar, XAxis, YAxis, CartesianGrid } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const ABC_COLORS = { 'A-核心': '#22c55e', 'B-成长': '#3b82f6', 'C-长尾': '#ef4444' }
 const PAGE_SIZE = 15
@@ -15,10 +16,11 @@ const PAGE_SIZE = 15
 export function SKUPage() {
   const [abcFilter, setAbcFilter] = useState('')
   const [skuPage, setSkuPage] = useState(1)
+  const [month, setMonth] = useState('2026-04')
 
   const { data: skuData, isLoading: skuLoading } = useQuery({
-    queryKey: ['sku/abc'],
-    queryFn: () => api.get('/sku/abc'),
+    queryKey: ['sku/abc', month],
+    queryFn: () => api.get('/sku/abc', { params: { month } }),
   })
 
   const { data: catData, isLoading: catLoading } = useQuery({
@@ -61,9 +63,12 @@ export function SKUPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">商品SKU管理</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">SKU ABC分析 · 长尾治理 · 品类结构 · 2026年4月</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">商品SKU管理</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">SKU ABC分析 · 长尾治理 · 品类结构 · {month}</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 概览指标 */}
diff --git a/client/src/pages/SiteSelectionPage.tsx b/client/src/pages/SiteSelectionPage.tsx
index 4d31b74..ec31a76 100644
--- a/client/src/pages/SiteSelectionPage.tsx
+++ b/client/src/pages/SiteSelectionPage.tsx
@@ -10,6 +10,7 @@ import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState, useMemo } from 'react'
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, ScatterChart, Scatter, ZAxis, ReferenceLine, Cell } from 'recharts'
 import { StoreMap } from '@/components/StoreMap'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const PAGE_SIZE = 15
 const SCENE_COLORS: Record<string, string> = {
@@ -33,30 +34,31 @@ export function SiteSelectionPage() {
   const [replPage, setReplPage] = useState(1)
   const [overlapPage, setOverlapPage] = useState(1)
   const [profilePage, setProfilePage] = useState(1)
+  const [month, setMonth] = useState('2026-04')
 
   const { data: profileData, isLoading: profileLoading } = useQuery({
-    queryKey: ['site-selection/profile'],
-    queryFn: () => api.get('/site-selection/profile'),
+    queryKey: ['site-selection/profile', month],
+    queryFn: () => api.get('/site-selection/profile', { params: { month } }),
   })
 
   const { data: segData, isLoading: segLoading } = useQuery({
-    queryKey: ['site-selection/segment-benchmark'],
-    queryFn: () => api.get('/site-selection/segment-benchmark'),
+    queryKey: ['site-selection/segment-benchmark', month],
+    queryFn: () => api.get('/site-selection/segment-benchmark', { params: { month } }),
   })
 
   const { data: replData, isLoading: replLoading } = useQuery({
-    queryKey: ['site-selection/replication'],
-    queryFn: () => api.get('/site-selection/replication'),
+    queryKey: ['site-selection/replication', month],
+    queryFn: () => api.get('/site-selection/replication', { params: { month } }),
   })
 
   const { data: overlapData, isLoading: overlapLoading } = useQuery({
-    queryKey: ['site-selection/overlap-risk'],
-    queryFn: () => api.get('/site-selection/overlap-risk'),
+    queryKey: ['site-selection/overlap-risk', month],
+    queryFn: () => api.get('/site-selection/overlap-risk', { params: { month } }),
   })
 
   const { data: districtData, isLoading: districtLoading } = useQuery({
-    queryKey: ['site-selection/district-benchmark'],
-    queryFn: () => api.get('/site-selection/district-benchmark'),
+    queryKey: ['site-selection/district-benchmark', month],
+    queryFn: () => api.get('/site-selection/district-benchmark', { params: { month } }),
   })
 
   const profileRows = ((profileData as any)?.data || []).filter((r: any) => !sceneFilter || r.site_scene === sceneFilter)
@@ -90,9 +92,12 @@ export function SiteSelectionPage() {
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-xl font-bold">门店选址分析</h1>
-        <p className="mt-0.5 text-xs text-muted-foreground">基于全部现有数据的选址决策支持 · 2026年4月 · 91家经营门店</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-xl font-bold">门店选址分析</h1>
+          <p className="mt-0.5 text-xs text-muted-foreground">基于现有数据的选址决策支持 · {month} · {totalStores}家经营门店</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       {/* 门店分布地图（左） + 指标+面积坪效分布（右） 左右并排 */}
diff --git a/client/src/pages/StoreExpensePage.tsx b/client/src/pages/StoreExpensePage.tsx
index 8c340f1..d2985d0 100644
--- a/client/src/pages/StoreExpensePage.tsx
+++ b/client/src/pages/StoreExpensePage.tsx
@@ -1,5 +1,6 @@
 import { useState } from 'react'
 import { Tabs } from '@/components/Tabs'
+import { MonthPicker } from '@/components/MonthPicker'
 import { ExpenseOverviewTab } from '@/components/store-expense/ExpenseOverviewTab'
 import { StoreRankingTab } from '@/components/store-expense/StoreRankingTab'
 import { ContributionTab } from '@/components/store-expense/ContributionTab'
@@ -26,27 +27,31 @@ const TABS = [
 
 export function StoreExpensePage() {
   const [activeTab, setActiveTab] = useState('overview')
+  const [month, setMonth] = useState('2026-04')
 
   return (
     <div className="space-y-4">
-      <div>
-        <h1 className="text-2xl font-bold">门店营业费用分析</h1>
-        <p className="text-sm text-muted-foreground mt-1">2026年4月 · 89家经营门店 · 费用合计 ¥31,811,801</p>
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold">门店营业费用分析</h1>
+          <p className="text-sm text-muted-foreground mt-1">{month} · 费用结构与贡献分析</p>
+        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       <Tabs tabs={TABS} active={activeTab} onChange={setActiveTab} />
 
       <div>
-        {activeTab === 'overview' && <ExpenseOverviewTab />}
-        {activeTab === 'ranking' && <StoreRankingTab />}
-        {activeTab === 'contribution' && <ContributionTab />}
-        {activeTab === 'rent' && <RentRiskTab />}
-        {activeTab === 'delivery' && <DeliveryTab />}
-        {activeTab === 'efficiency' && <EfficiencyTab />}
-        {activeTab === 'fixed-variable' && <FixedVariableTab />}
-        {activeTab === 'break-even' && <BreakEvenTab />}
-        {activeTab === 'loss-diagnosis' && <LossDiagnosisTab />}
-        {activeTab === 'evaluation' && <StoreEvaluationTab />}
+        {activeTab === 'overview' && <ExpenseOverviewTab month={month} />}
+        {activeTab === 'ranking' && <StoreRankingTab month={month} />}
+        {activeTab === 'contribution' && <ContributionTab month={month} />}
+        {activeTab === 'rent' && <RentRiskTab month={month} />}
+        {activeTab === 'delivery' && <DeliveryTab month={month} />}
+        {activeTab === 'efficiency' && <EfficiencyTab month={month} />}
+        {activeTab === 'fixed-variable' && <FixedVariableTab month={month} />}
+        {activeTab === 'break-even' && <BreakEvenTab month={month} />}
+        {activeTab === 'loss-diagnosis' && <LossDiagnosisTab month={month} />}
+        {activeTab === 'evaluation' && <StoreEvaluationTab month={month} />}
       </div>
     </div>
   )