diff --git a/src/controllers/mail.controller.ts b/src/controllers/mail.controller.ts
index 5df985a..78a2e46 100644
--- a/src/controllers/mail.controller.ts
+++ b/src/controllers/mail.controller.ts
@@ -117,6 +117,12 @@ class MailController extends BaseController {
       throw new ZError(10, 'params mismatch')
     }
     type = parseInt(type)
+    if (type === CodeType.REGIST) {
+      let account = await Account.findByEmail(email)
+      if (account) {
+        throw new ZError(11, 'account exists')
+      }
+    }
     let record = await CodeRecord.findByEmail(email, type)
     if (!record) {
       record = new CodeRecord({ email, type, code: DEFAULT_CODE })
@@ -158,6 +164,6 @@ class MailController extends BaseController {
       throw new ZError(10, 'params mismatch')
     }
     let account = await Account.findByEmail(email)
-    return { exists: !account }
+    return { exists: !!account }
   }
 }