diff --git a/backend/services/auth-service/src/application/services/sms.service.ts b/backend/services/auth-service/src/application/services/sms.service.ts
index f8cf1139..4050d868 100644
--- a/backend/services/auth-service/src/application/services/sms.service.ts
+++ b/backend/services/auth-service/src/application/services/sms.service.ts
@@ -168,11 +168,12 @@ export class SmsService {
     });
 
     const response = await client.sendSms(request);
-    if (response.body.code !== 'OK') {
-      this.logger.error(`阿里云短信发送失败: ${response.body.code} - ${response.body.message}`);
+    const body = response.body;
+    if (!body || body.code !== 'OK') {
+      this.logger.error(`阿里云短信发送失败: ${body?.code} - ${body?.message}`);
       throw new BadRequestException('短信发送失败，请稍后重试');
     }
 
-    this.logger.log(`短信发送成功: ${phone}, BizId: ${response.body.bizId}`);
+    this.logger.log(`短信发送成功: ${phone}, BizId: ${body.bizId}`);
   }
 }