diff --git a/app/src/main/java/com/techcourse/service/TxUserService.java b/app/src/main/java/com/techcourse/service/TxUserService.java
index 3c018a592a..4bc2d4021d 100644
--- a/app/src/main/java/com/techcourse/service/TxUserService.java
+++ b/app/src/main/java/com/techcourse/service/TxUserService.java
@@ -1,33 +1,30 @@
 package com.techcourse.service;
 
-import com.techcourse.dao.UserDao;
-import com.techcourse.dao.UserHistoryDao;
 import com.techcourse.domain.User;
-import com.techcourse.domain.UserHistory;
 import org.springframework.transaction.support.TransactionTemplate;
 
 public class TxUserService implements UserService {
 
-    private final UserService userService;
+    private final AppUserService appUserService;
     private final TransactionTemplate transactionTemplate;
 
-    public TxUserService(final UserService userService, final TransactionTemplate transactionTemplate) {
-        this.userService = userService;
+    public TxUserService(final AppUserService appUserService, final TransactionTemplate transactionTemplate) {
+        this.appUserService = appUserService;
         this.transactionTemplate = transactionTemplate;
     }
 
     @Override
     public User findById(final long id) {
-        return userService.findById(id);
+        return appUserService.findById(id);
     }
 
     @Override
     public void insert(final User user) {
-        transactionTemplate.execute(connection -> userService.insert(user));
+        transactionTemplate.execute(connection -> appUserService.insert(user));
     }
 
     @Override
     public void changePassword(final long id, final String newPassword, final String createBy) {
-        transactionTemplate.execute(connection -> userService.changePassword(id, newPassword, createBy));
+        transactionTemplate.execute(connection -> appUserService.changePassword(id, newPassword, createBy));
     }
 }
diff --git a/app/src/test/java/com/techcourse/service/TxUserServiceTest.java b/app/src/test/java/com/techcourse/service/TxUserServiceTest.java
index 29e86f88ca..138b3db602 100644
--- a/app/src/test/java/com/techcourse/service/TxUserServiceTest.java
+++ b/app/src/test/java/com/techcourse/service/TxUserServiceTest.java
@@ -6,7 +6,6 @@
 import com.techcourse.domain.User;
 import com.techcourse.support.jdbc.init.DatabasePopulatorUtils;
 import org.springframework.dao.DataAccessException;
-import org.springframework.jdbc.core.JdbcTemplate;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.springframework.transaction.support.TransactionTemplate;
@@ -16,7 +15,6 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.spy;
 
@@ -24,7 +22,7 @@ class TxUserServiceTest {
 
     private DataSource dataSource;
     private UserDao userDao;
-    private UserService userService;
+    private AppUserService appUserService;
     private TransactionTemplate transactionTemplate;
 
     @BeforeEach
@@ -32,7 +30,7 @@ void setUp() {
         this.dataSource = DataSourceConfig.getInstance();
         this.userDao = new UserDao(dataSource);
         UserHistoryDao userHistoryDao = new UserHistoryDao(dataSource);
-        this.userService = new AppUserService(userDao, userHistoryDao);
+        this.appUserService = new AppUserService(userDao, userHistoryDao);
         this.transactionTemplate = new TransactionTemplate(dataSource);
 
         DatabasePopulatorUtils.execute(DataSourceConfig.getInstance());
@@ -42,11 +40,11 @@ void setUp() {
 
     @Test
     void testChangePassword() {
-        final var txUserService = new TxUserService(userService, transactionTemplate);
+        final var txUserService = new TxUserService(appUserService, transactionTemplate);
 
         final var newPassword = "qqqqq";
         final var createBy = "gugu";
-        userService.changePassword(1L, newPassword, createBy);
+        appUserService.changePassword(1L, newPassword, createBy);
 
         final var actual = txUserService.findById(1L);