diff --git a/backend/src/services/contract.service.ts b/backend/src/services/contract.service.ts
index ae9210e..a3ce120 100644
--- a/backend/src/services/contract.service.ts
+++ b/backend/src/services/contract.service.ts
@@ -688,20 +688,17 @@ export async function updateEmployee(orgId: string, id: string, data: any) {
   if (data.name !== undefined) updateData.name = data.name
   if (data.department !== undefined) updateData.department = data.department
   if (data.hireDate !== undefined) updateData.hireDate = new Date(data.hireDate)
-  if (data.monthlySalary !== undefined) {
+  if (data.baseSalary !== undefined || data.performanceSalary !== undefined) {
     const oldSalary = Number(decrypt(employee.monthlySalary)) || 0
-    // 如果同时传了 baseSalary 和 performanceSalary，自动计算 monthlySalary = base + perf
-    const baseNum = data.baseSalary !== undefined ? Number(data.baseSalary) || 0 : null
-    const perfNum = data.performanceSalary !== undefined ? Number(data.performanceSalary) || 0 : null
-    const newSalary = (baseNum !== null && perfNum !== null) ? baseNum + perfNum : (Number(data.monthlySalary) || 0)
+    // monthlySalary 始终由 baseSalary + performanceSalary 计算
+    const baseNum = data.baseSalary !== undefined ? Number(data.baseSalary) || 0
+      : (employee.baseSalary ? Number(decrypt(employee.baseSalary)) || 0 : 0)
+    const perfNum = data.performanceSalary !== undefined ? Number(data.performanceSalary) || 0
+      : (employee.performanceSalary ? Number(decrypt(employee.performanceSalary)) || 0 : 0)
+    const newSalary = baseNum + perfNum
     updateData.monthlySalary = encrypt(String(newSalary))
-    // 同步更新工资结构
-    if (data.baseSalary !== undefined) {
-      updateData.baseSalary = encrypt(String(Number(data.baseSalary) || 0))
-    }
-    if (data.performanceSalary !== undefined) {
-      updateData.performanceSalary = encrypt(String(Number(data.performanceSalary) || 0))
-    }
+    if (data.baseSalary !== undefined) updateData.baseSalary = encrypt(String(baseNum))
+    if (data.performanceSalary !== undefined) updateData.performanceSalary = encrypt(String(perfNum))
     // 记录薪资变更
     if (oldSalary !== newSalary) {
       const now = new Date()