diff --git a/packages/ui/certd-server/src/modules/basic/service/email-service.ts b/packages/ui/certd-server/src/modules/basic/service/email-service.ts
index 426d84ac..1a15ab55 100644
--- a/packages/ui/certd-server/src/modules/basic/service/email-service.ts
+++ b/packages/ui/certd-server/src/modules/basic/service/email-service.ts
@@ -89,7 +89,7 @@ export class EmailService implements IEmailService {
       }
     }
     let subject = email.subject;
-    if (!subject.startsWith(`【${sysTitle}】`)) {
+    if (!subject.includes(`【${sysTitle}】`)) {
       subject = `【${sysTitle}】${subject}`;
     }
     const mailOptions = {