diff --git a/backend/services/trading-service/src/application/services/payment-proof.service.ts b/backend/services/trading-service/src/application/services/payment-proof.service.ts
index 924d54ea..fac24d71 100644
--- a/backend/services/trading-service/src/application/services/payment-proof.service.ts
+++ b/backend/services/trading-service/src/application/services/payment-proof.service.ts
@@ -40,7 +40,9 @@ export class PaymentProofService {
   }
 
   private buildSvg(data: ProofData): string {
-    const time = data.completedAt.toISOString().replace('T', ' ').slice(0, 19);
+    // toISOString() 返回 UTC，手动加 8 小时转北京时间
+    const beijingDate = new Date(data.completedAt.getTime() + 8 * 60 * 60 * 1000);
+    const time = beijingDate.toISOString().replace('T', ' ').slice(0, 19);
 
     return `<svg xmlns="http://www.w3.org/2000/svg" width="600" height="420">
   <defs>