diff --git a/src/main/java/com/moment/the/improvement/service/ImprovementService.java b/src/main/java/com/moment/the/improvement/service/ImprovementService.java
index 7c46b6f8..e72ce6a8 100644
--- a/src/main/java/com/moment/the/improvement/service/ImprovementService.java
+++ b/src/main/java/com/moment/the/improvement/service/ImprovementService.java
@@ -2,7 +2,8 @@
 
 import com.moment.the.admin.AdminDomain;
 import com.moment.the.admin.repository.AdminRepository;
-import com.moment.the.exceptionAdvice.exception.NoImprovementException;
+import com.moment.the.admin.service.AdminServiceImpl;
+import com.moment.the.exceptionAdvice.exception.AccessNotFoundException;
 import com.moment.the.exceptionAdvice.exception.UserNotFoundException;
 import com.moment.the.improvement.ImprovementDomain;
 import com.moment.the.improvement.dto.ImprovementDto;
@@ -10,8 +11,6 @@
 import com.moment.the.improvement.repository.ImprovementRepository;
 import lombok.RequiredArgsConstructor;
 import org.modelmapper.ModelMapper;
-import org.springframework.security.core.context.SecurityContextHolder;
-import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -27,10 +26,8 @@ public class ImprovementService {
     // Create improvement.
     @Transactional
     public ImprovementDomain save(ImprovementDto improvementDto){
-        // 현재 user 정보를 가져오기
-        String UserEmail = getUserEmail();
         try {
-            AdminDomain adminDomain = adminRepository.findByAdminId(UserEmail);
+            AdminDomain adminDomain = adminRepository.findByAdminId(AdminServiceImpl.getUserEmail());
             return improvementRepository.save(improvementDto.ToEntity(adminDomain));
         } catch (UserNotFoundException e){
             throw new UserNotFoundException();
@@ -48,42 +45,23 @@ public List<ImprovementViewAllDto> read(){
     // Update improvement.
     @Transactional
     public void update(ImprovementDto improvementDto, Long improveIdx){
-        // 현재 user 정보를 가져오기
-        try {
-            String UserEmail = getUserEmail();
-            AdminDomain adminDomain = adminRepository.findByAdminId(UserEmail);
-        } catch (UserNotFoundException e){
-            System.err.println("UserNotFoundException 이 발생했습니다.");
-        }
         // 개선 사례 가져오기
-        try {
-            ImprovementDomain improvementDomain = improvementRepository.findByImproveIdx(improveIdx);
+        ImprovementDomain improvementDomain = improvementRepository.findByImproveIdx(improveIdx);
+        if(improvementDomain.getAdminDomain().getAdminId().equals(AdminServiceImpl.getUserEmail())){
             improvementDomain.update(improvementDto);
-        } catch (NoImprovementException e){
-            System.err.println("NoImprovementException 이 발생했습니다.");
+        } else {
+            throw new AccessNotFoundException();
         }
     }
 
     // Delete improvement.
     @Transactional
     public void delete(Long improveIdx){
-        try {
-            ImprovementDomain selectImprove = improvementRepository.findByImproveIdx(improveIdx);
+        ImprovementDomain selectImprove = improvementRepository.findByImproveIdx(improveIdx);
+        if(selectImprove.getAdminDomain().getAdminId().equals(AdminServiceImpl.getUserEmail())){
             improvementRepository.delete(selectImprove);
-        } catch (NoImprovementException e){
-            System.err.println("NoImprovementException 이 발생했습니다.");
-        }
-    }
-
-    // Current UserEmail을 가져오기.
-    public String getUserEmail() {
-        String userEmail;
-        Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
-        if(principal instanceof UserDetails) {
-            userEmail = ((UserDetails) principal).getUsername();
         } else {
-            userEmail = principal.toString();
+            throw new AccessNotFoundException();
         }
-        return userEmail;
     }
 }
diff --git a/src/test/java/com/moment/the/improvement/service/ImprovementServiceTest.java b/src/test/java/com/moment/the/improvement/service/ImprovementServiceTest.java
new file mode 100644
index 00000000..388dd29b
--- /dev/null
+++ b/src/test/java/com/moment/the/improvement/service/ImprovementServiceTest.java
@@ -0,0 +1,81 @@
+package com.moment.the.improvement.service;
+
+import com.moment.the.admin.AdminDomain;
+import com.moment.the.admin.dto.AdminDto;
+import com.moment.the.admin.repository.AdminRepository;
+import com.moment.the.admin.service.AdminService;
+import com.moment.the.improvement.dto.ImprovementDto;
+import com.moment.the.improvement.repository.ImprovementRepository;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.context.SecurityContext;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.awt.*;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+@Transactional
+class ImprovementServiceTest {
+    @Autowired
+    private ImprovementRepository improvementRepository;
+    @Autowired
+    private ImprovementService improvementService;
+    @Autowired
+    private AdminService adminService;
+    @Autowired
+    private AdminRepository adminRepository;
+    @AfterEach
+    void deleteData(){
+        improvementRepository.deleteAll();
+    }
+
+    // test 편의를 위한 회원가입 매서드
+    void adminSignUp(String adminId, String password, String adminName) throws Exception {
+        AdminDto adminDto = new AdminDto(adminId, password, adminName);
+        adminService.signUp(adminDto);
+    }
+
+    // test 편의를 위한 로그인 매서드
+    AdminDomain adminLogin(String adminId, String password) throws Exception {
+        AdminDomain adminDomain = adminRepository.findByAdminId(adminId);
+        UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(
+                adminDomain.getAdminId(),
+                adminDomain.getAdminPwd(),
+                List.of(new SimpleGrantedAuthority("ROLE_USER")));
+        SecurityContext context = SecurityContextHolder.getContext();
+        context.setAuthentication(token);
+
+        return adminDomain;
+    }
+
+    @Test
+    void 실제개선사례작성() throws Exception {
+        //Given admin
+        String email = "asdf@gsm";
+        String pw = "1234";
+        String name = "jihwan";
+        adminSignUp(email, pw, name);
+        adminLogin(email, pw);
+
+        //Given improvement
+        ImprovementDto improvementDto = new ImprovementDto();
+        improvementDto.setImproveContent("Hello world");
+        improvementDto.setImproveContent("it's jihwan");
+
+        //when
+        improvementService.save(improvementDto);
+
+        //then
+        assertEquals(false, improvementRepository.findByImproveContent("it's jihwan") == null);
+        assertEquals(true, improvementRepository.findByImproveContent("it's jihwan").getAdminDomain().getAdminId().equals("asdf@gsm"));
+    }
+
+}
\ No newline at end of file