diff --git a/src/main/java/club/joylink/xiannccda/configuration/ResponseExceptionHandler.java b/src/main/java/club/joylink/xiannccda/configuration/ResponseExceptionHandler.java
index f447336..bf1d130 100644
--- a/src/main/java/club/joylink/xiannccda/configuration/ResponseExceptionHandler.java
+++ b/src/main/java/club/joylink/xiannccda/configuration/ResponseExceptionHandler.java
@@ -26,7 +26,7 @@ public class ResponseExceptionHandler {
   @ExceptionHandler(Exception.class)
   public ProblemDetail UncaughtExceptionHandler(Exception e) {
     ProblemDetail problemDetail = ProblemDetail.forStatus(HttpStatus.INTERNAL_SERVER_ERROR);
-    problemDetail.setTitle("未处理异常");
+    problemDetail.setTitle("未知错误");
     problemDetail.setDetail(e.getMessage());
     return problemDetail;
   }
diff --git a/src/main/java/club/joylink/xiannccda/configuration/SpringSecurityConfiguration.java b/src/main/java/club/joylink/xiannccda/configuration/SpringSecurityConfiguration.java
index 53da929..decd903 100644
--- a/src/main/java/club/joylink/xiannccda/configuration/SpringSecurityConfiguration.java
+++ b/src/main/java/club/joylink/xiannccda/configuration/SpringSecurityConfiguration.java
@@ -105,16 +105,6 @@ public class SpringSecurityConfiguration {
     return jwtAuthenticationConverter;
   }
 
-  /**
-   * Spring Security用户username/password认证使用的password编码器
-   *
-   * @return
-   */
-  @Bean
-  public PasswordEncoder passwordEncoder() {
-    return new BCryptPasswordEncoder(13);
-  }
-
   /**
    * JWT解码器
    *
diff --git a/src/main/java/club/joylink/xiannccda/service/UserService.java b/src/main/java/club/joylink/xiannccda/service/UserService.java
index 88c996b..56edc2c 100644
--- a/src/main/java/club/joylink/xiannccda/service/UserService.java
+++ b/src/main/java/club/joylink/xiannccda/service/UserService.java
@@ -26,6 +26,11 @@ public class UserService {
   }
 
   public String register(User user) {
+    BusinessExceptionAssertEnum.UNIQUE_FIELD_REPEAT.assertTrue(
+        this.userRepository.count(
+            Wrappers.<User>lambdaQuery().eq(User::getMobile, user.getMobile())) <= 0,
+        "手机号已经被注册"
+    );
     user.setRegisterTime(LocalDateTime.now());
     this.userRepository.save(user);
     return user.getId() + "";