diff --git a/backend/src/app.ts b/backend/src/app.ts
index ca4e0d8..712fb76 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -8,6 +8,8 @@ import { apiLimiter } from './middleware/rateLimit'
 
 const app = express()
 
+app.set('trust proxy', 1)
+
 app.use(helmet())
 app.use(compression({
   filter: (req, res) => {
diff --git a/backend/src/routes/social.routes.ts b/backend/src/routes/social.routes.ts
index 8cff103..b37a456 100644
--- a/backend/src/routes/social.routes.ts
+++ b/backend/src/routes/social.routes.ts
@@ -429,7 +429,7 @@ router.post('/calculate', async (req: AuthRequest, res: Response, next: NextFunc
     // 附加险种
     const extraItems: any[] = []
     if (config.extraInsurances && Array.isArray(config.extraInsurances)) {
-      for (const ins of config.extraInsurances) {
+      for (const ins of config.extraInsurances as any[]) {
         const insBase = ins.baseType === 'medical' ? medicalBase : ins.baseType === 'fixed' ? 1 : actualBase
         if (ins.baseType === 'fixed' && ins.fixedAmount) {
           const orgAmt = ins.fixedAmount
@@ -832,7 +832,7 @@ function calcSocialDetail(base: number, config: any) {
   ]
   // 附加险种
   if (config.extraInsurances && Array.isArray(config.extraInsurances)) {
-    for (const ins of config.extraInsurances) {
+    for (const ins of config.extraInsurances as any[]) {
       const insBase = ins.baseType === 'medical' ? medicalBase : ins.baseType === 'fixed' ? 1 : actualBase
       if (ins.baseType === 'fixed' && ins.fixedAmount) {
         items.push({ name: ins.name, orgRate: 0, empRate: 0, orgAmount: ins.fixedAmount, empAmount: ins.empFixedAmount || 0 })
diff --git a/backend/src/services/payroll.service.ts b/backend/src/services/payroll.service.ts
index 673d4cc..afc9fc3 100644
--- a/backend/src/services/payroll.service.ts
+++ b/backend/src/services/payroll.service.ts
@@ -46,7 +46,7 @@ export function calcSocialInsurance(base: number, config: any) {
   // 附加险种（大病险/长护险等）
   const extraItems: any[] = []
   if (config.extraInsurances && Array.isArray(config.extraInsurances)) {
-    for (const ins of config.extraInsurances) {
+    for (const ins of config.extraInsurances as any[]) {
       const insBase = ins.baseType === 'medical' ? medicalBase : ins.baseType === 'fixed' ? 1 : actualBase
       if (ins.baseType === 'fixed' && ins.fixedAmount) {
         const orgAmt = ins.fixedAmount