diff --git a/.settings/org.eclipse.m2e.core.prefs b/.settings/org.eclipse.m2e.core.prefs
index 96b30f9..f897a7f 100644
--- a/.settings/org.eclipse.m2e.core.prefs
+++ b/.settings/org.eclipse.m2e.core.prefs
@@ -1,4 +1,4 @@
-activeProfiles=pom.xml
+activeProfiles=
 eclipse.preferences.version=1
 resolveWorkspaceProjects=true
 version=1
diff --git a/src/main/java/co/jp/app/common/ResultCode.java b/src/main/java/co/jp/app/common/ResultCode.java
index 41946e0..4c2dcf3 100644
--- a/src/main/java/co/jp/app/common/ResultCode.java
+++ b/src/main/java/co/jp/app/common/ResultCode.java
@@ -28,7 +28,7 @@ public enum ResultCode {
     // 注册相关
     // USER_REGISTRATION_SUCCESS(3000, "用户注册成功"),
     USER_EMAIL_ALREADY_EXISTS(3001, "Email already exists"),
-    // USER_USERNAME_ALREADY_EXISTS(3002, "Username"),
+    USER_USERNAME_ALREADY_EXISTS(3002, "Username"),
     USER_PASSWORD_TOO_SHORT(3003, "password too short"),
     USER_PASSWORD_TOO_WEAK(3004, "password too weak"),
     USER_REGISTRATION_FAILED(3005, "User registration failed"),
diff --git a/src/main/java/co/jp/app/repository/UserRepository.java b/src/main/java/co/jp/app/repository/UserRepository.java
index bbadc8f..45dadb3 100644
--- a/src/main/java/co/jp/app/repository/UserRepository.java
+++ b/src/main/java/co/jp/app/repository/UserRepository.java
@@ -14,4 +14,8 @@ public interface UserRepository extends JpaRepository<UserEntity, Integer> {
 	boolean existsByEmail(String email);
 
 	Optional<UserEntity> findByEmail(String email);
+
+	boolean existsByName(String name);
+	
+	Optional<UserEntity> findByName(String name);
 }
\ No newline at end of file
diff --git a/src/main/java/co/jp/app/service/UserService.java b/src/main/java/co/jp/app/service/UserService.java
index 05a641a..e3ad20f 100644
--- a/src/main/java/co/jp/app/service/UserService.java
+++ b/src/main/java/co/jp/app/service/UserService.java
@@ -3,8 +3,6 @@ package co.jp.app.service;
 import java.util.Collection;
 import java.util.Collections;
 
-import co.jp.app.common.ResultCode;
-import co.jp.app.exception.BusinessException;
 import org.jetbrains.annotations.NotNull;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
@@ -16,8 +14,10 @@ import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import co.jp.app.common.ResultCode;
 import co.jp.app.dto.RegistrationDto;
 import co.jp.app.entity.UserEntity;
+import co.jp.app.exception.BusinessException;
 import co.jp.app.repository.UserRepository;
 
 @Service
@@ -31,11 +31,11 @@ public class UserService implements UserDetailsService {
 		this.passwordEncoder = passwordEncoder;
 	}
 
-	@Transactional
+	
 	public UserEntity registerNewUser(@NotNull RegistrationDto registrationDto) throws BusinessException {
 
-		if (userRepository.existsByEmail(registrationDto.getEmail())) {
-			throw new BusinessException(ResultCode.USER_EMAIL_ALREADY_EXISTS,"error: Email" + registrationDto.getEmail() + " had been used");
+		if (userRepository.existsByName(registrationDto.getName())) {
+			throw new BusinessException(ResultCode.USER_USERNAME_ALREADY_EXISTS,"error: Name" + registrationDto.getName() + " had been used");
 		}
 
 		//密码最短6位限制
@@ -51,17 +51,19 @@ public class UserService implements UserDetailsService {
 		return userRepository.save(newUser);
 	}
 
+	
+	
 	@Override
 	@Transactional(readOnly = true)
-	public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
-		UserEntity userEntity = userRepository.findByEmail(email)
-				.orElseThrow(() -> new UsernameNotFoundException(email + " not found"));
+	public UserDetails loadUserByUsername(String name) throws UsernameNotFoundException {
+		UserEntity userEntity = userRepository.findByName(name)
+				.orElseThrow(() -> new UsernameNotFoundException(name + " not found"));
 
 		Collection<? extends GrantedAuthority> authorities = Collections
 				.singletonList(new SimpleGrantedAuthority("ROLE_USER"));
 
 		return new User(
-				userEntity.getEmail(),
+				userEntity.getName(),
 				userEntity.getPassword(),
 				true, // enabled
 				true, // accountNonExpired
diff --git a/target/classes/META-INF/maven/co.jp.app/dog-2/pom.properties b/target/classes/META-INF/maven/co.jp.app/dog-2/pom.properties
deleted file mode 100644
index 19b3b9b..0000000
--- a/target/classes/META-INF/maven/co.jp.app/dog-2/pom.properties
+++ /dev/null
@@ -1,7 +0,0 @@
-#Generated by Maven Integration for Eclipse
-#Fri May 16 11:13:59 JST 2025
-m2e.projectLocation=C\:\\Users\\ichbi\\git\\Dog-1
-m2e.projectName=dog-1
-groupId=co.jp.app
-artifactId=dog-2
-version=0.0.1-SNAPSHOT