diff --git a/src/main/java/org/cmh/backend/authentication/controller/AuthenticationController.java b/src/main/java/org/cmh/backend/authentication/controller/AuthenticationController.java
index 8ec56df..1f2c243 100644
--- a/src/main/java/org/cmh/backend/authentication/controller/AuthenticationController.java
+++ b/src/main/java/org/cmh/backend/authentication/controller/AuthenticationController.java
@@ -1,13 +1,54 @@
 package org.cmh.backend.authentication.controller;
 
 
+import lombok.Getter;
+import lombok.Setter;
+import org.cmh.backend.authentication.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.util.HashMap;
+import java.util.Map;
+
 @RestController
 class AuthenticationController {
+
+    @Autowired
+    private UserService userService;
+
     @GetMapping("/hello")
-    public String hello(){
+    public String hello() {
         return "Hello SpringBoot!";
     }
-}
\ No newline at end of file
+
+    @PostMapping("/register")
+    public ResponseEntity<Map<String, Object>> register(@RequestBody RegisterRequest request) {
+        Map<String, Object> response = new HashMap<>();
+
+        boolean isRegistered = userService.registerUser(request.getUsername(), request.getPassword(), request.getContactInfo());
+        if (isRegistered) {
+            response.put("message", "Registration successful!");
+            return new ResponseEntity<>(response, HttpStatus.OK);
+        } else {
+            response.put("message", "Registration failed! User already exist");
+            return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST);
+        }
+    }
+
+
+}
+
+// DTO classes
+@Getter
+@Setter
+class RegisterRequest {
+    private String username;
+    private String password;
+    private String contactInfo;
+}
+
diff --git a/src/main/java/org/cmh/backend/authentication/service/UserService.java b/src/main/java/org/cmh/backend/authentication/service/UserService.java
index 1351b1f..0562188 100644
--- a/src/main/java/org/cmh/backend/authentication/service/UserService.java
+++ b/src/main/java/org/cmh/backend/authentication/service/UserService.java
@@ -3,14 +3,70 @@ package org.cmh.backend.authentication.service;
 import org.cmh.backend.authentication.model.UserHS;
 import org.cmh.backend.authentication.repository.UserRepository;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
+import java.time.LocalDateTime;
+import java.util.regex.Pattern;
+
 @Service
 public class UserService {
     @Autowired
     private UserRepository userRepository;
 
+    private PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
+
     public UserHS getUserByUsername(String username) {
         return userRepository.findByUsername(username);
     }
-}
+
+    public boolean registerUser(String username, String password, String contactInfo) {
+        // 验证用户名是否已存在
+        if (userRepository.findByUsername(username) != null) {
+            return false; // 用户已存在
+        }
+
+        // 验证输入格式
+        if (!isValidUsername(username) || !isValidPassword(password) || !isValidContactInfo(contactInfo)) {
+            return false; // 输入格式不正确
+        }
+
+        // 加密密码
+        String encodedPassword = passwordEncoder.encode(password);
+
+        // 创建新用户
+        UserHS newUser = new UserHS();
+        newUser.setUsername(username);
+        newUser.setPassword(encodedPassword);
+        newUser.setPhoneNumber(contactInfo); // 假设contactInfo是电话号码
+        newUser.setCreatedAt(LocalDateTime.now());
+
+        try {
+            userRepository.save(newUser);
+        } catch (Exception e) {
+            // 处理保存用户时可能出现的异常
+            return false;
+        }
+
+        return true;
+    }
+
+
+    // 验证用户名格式
+    private boolean isValidUsername(String username) {
+        return username != null && username.length() >= 3 && username.length() <= 20;
+    }
+
+    // 验证密码格式
+    private boolean isValidPassword(String password) {
+        return password != null && password.length() >= 4;
+    }
+
+    // 验证联系方式格式（假设为电话号码）
+    private boolean isValidContactInfo(String contactInfo) {
+        String regex = "^\\+?[0-9. ()-]{7,25}$"; // 电话号码验证
+        return contactInfo != null && Pattern.matches(regex, contactInfo);
+    }
+
+}
\ No newline at end of file