diff --git a/src/main/java/com/ai/da/service/impl/ConvenientInquiryServiceImpl.java b/src/main/java/com/ai/da/service/impl/ConvenientInquiryServiceImpl.java
index b664ed21..43c99f5a 100644
--- a/src/main/java/com/ai/da/service/impl/ConvenientInquiryServiceImpl.java
+++ b/src/main/java/com/ai/da/service/impl/ConvenientInquiryServiceImpl.java
@@ -437,8 +437,16 @@ public class ConvenientInquiryServiceImpl extends ServiceImpl<QuestionnaireMappe
     public Boolean addUser(AccountAddDTO accountAddDTO) {
         // 需要给的数据 用户邮箱、用户名、账号有效期截止时间、账号类型
         Account account = CopyUtil.copyObject(accountAddDTO, Account.class);
+        QueryWrapper<Account> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("user_email", account.getUserEmail());
+
+        Account existsAccount = accountMapper.selectOne(queryWrapper);
+        if (!Objects.isNull(existsAccount)){
+            throw new BusinessException("The email address already exists. One email address can only register one AiDA account");
+        }
 
         // 添加正式用户
+        assert accountAddDTO != null;
         if (Objects.isNull(accountAddDTO.getSystemUser())) {
             throw new BusinessException("you have to choose user type");
         } else {