diff --git a/src/main/java/com/syncd/adapter/in/web/ProjectController.java b/src/main/java/com/syncd/adapter/in/web/ProjectController.java
index 15acc25..53eba29 100644
--- a/src/main/java/com/syncd/adapter/in/web/ProjectController.java
+++ b/src/main/java/com/syncd/adapter/in/web/ProjectController.java
@@ -57,7 +57,7 @@ public JoinProjectResponseDto joinProject(HttpServletRequest request, @Valid @Re
     @PostMapping("/invite")
     public InviteUserInProjectResponseDto inviteUser(HttpServletRequest request, @Valid @RequestBody InviteUserInProjectRequestDto requestDto){
         String token = jwtService.resolveToken(request);
-        return inviteUserInProjectUsecase.inviteUserInProject(jwtService.getUserIdFromToken(token), requestDto.projectId(), requestDto.users());
+        return inviteUserInProjectUsecase.inviteUserInProject(jwtService.getUserIdFromToken(token),jwtService.getUsernameFromToken(token), requestDto.projectId(), requestDto.users());
     }
 
     @PostMapping("/withdraw")
diff --git a/src/main/java/com/syncd/application/port/in/GetUserInfoUsecase.java b/src/main/java/com/syncd/application/port/in/GetUserInfoUsecase.java
index b69b627..814469e 100644
--- a/src/main/java/com/syncd/application/port/in/GetUserInfoUsecase.java
+++ b/src/main/java/com/syncd/application/port/in/GetUserInfoUsecase.java
@@ -21,6 +21,8 @@ GetUserInfoResponseDto getUserInfo(
     record GetUserInfoResponseDto(
 
             String userId,
+
+            String userIdForSendbird,
             String name,
             String img,
             String email,
diff --git a/src/main/java/com/syncd/application/port/in/InviteUserInProjectUsecase.java b/src/main/java/com/syncd/application/port/in/InviteUserInProjectUsecase.java
index 5b075c4..a6e0265 100644
--- a/src/main/java/com/syncd/application/port/in/InviteUserInProjectUsecase.java
+++ b/src/main/java/com/syncd/application/port/in/InviteUserInProjectUsecase.java
@@ -11,7 +11,7 @@ public interface InviteUserInProjectUsecase {
     // ======================================
     // METHOD
     // ======================================
-    InviteUserInProjectResponseDto inviteUserInProject(String userId, String projectId, List<String> users);
+    InviteUserInProjectResponseDto inviteUserInProject(String userId,String hostName, String projectId, List<String> users);
     // ======================================
     // DTO
     // ======================================
diff --git a/src/main/java/com/syncd/application/service/ProjectService.java b/src/main/java/com/syncd/application/service/ProjectService.java
index 5f43bdc..f0d7a5a 100644
--- a/src/main/java/com/syncd/application/service/ProjectService.java
+++ b/src/main/java/com/syncd/application/service/ProjectService.java
@@ -62,7 +62,7 @@ public CreateProjectResponseDto createProject(String hostId, String hostName, St
         }
         CreateProjectResponseDto createProjectResponseDto = new CreateProjectResponseDto(writeProjectPort.CreateProject(project));
 
-        User host = readUserPort.findByUserId(hostId);
+//        User host = readUserPort.findByUserId(hostId);
 //        List<UserInProject> members = new ArrayList<>();
 //        if (userEmails != null && !userEmails.isEmpty()) {
 //            members = userEmails.stream()
@@ -70,6 +70,7 @@ public CreateProjectResponseDto createProject(String hostId, String hostName, St
 //                    .collect(Collectors.toList());
 //        }
 
+
         return createProjectResponseDto;
     }
 
@@ -135,15 +136,19 @@ public DeleteProjectResponseDto deleteProject(String userId, String projectId) {
 
 
     @Override
-    public InviteUserInProjectResponseDto inviteUserInProject(String userId, String projectId, List<String> userEmails) {
+    public InviteUserInProjectResponseDto inviteUserInProject(String userId,String hostName, String projectId, List<String> userEmails) {
         Project project = readProjectPort.findProjectByProjectId(projectId);
         checkHost(project, userId);
+        if (userEmails != null && !userEmails.isEmpty()){
+            project.addUsers(userInProjectFromEmail(userEmails));
+            sendMailPort.sendIviteMailBatch(hostName, project.getName(), userEmails, project.getId());
+        }
 
-        User host = readUserPort.findByUserId(userId);
-        // List<UserInProject> users = projectMappers.mapEmailsToUsersInProject(userEmails, host.getName(), project.getName(), projectId, readUserPort, sendMailPort);
-        List<UserInProject> users = userEmails.stream()
-                .map(email -> createUserInProjectWithRoleMember(email, host.getName(), project.getName(), projectId))
-                .collect(Collectors.toList());
+//        User host = readUserPort.findByUserId(userId);
+//        // List<UserInProject> users = projectMappers.mapEmailsToUsersInProject(userEmails, host.getName(), project.getName(), projectId, readUserPort, sendMailPort);
+//        List<UserInProject> users = userEmails.stream()
+//                .map(email -> createUserInProjectWithRoleMember(email, host.getName(), project.getName(), projectId))
+//                .collect(Collectors.toList());
 
         return new InviteUserInProjectResponseDto(projectId);
     }
diff --git a/src/main/java/com/syncd/application/service/UserService.java b/src/main/java/com/syncd/application/service/UserService.java
index ea62a6f..640c4f5 100644
--- a/src/main/java/com/syncd/application/service/UserService.java
+++ b/src/main/java/com/syncd/application/service/UserService.java
@@ -15,11 +15,15 @@
 import org.springframework.context.annotation.Primary;
 //import org.springframework.security.core.userdetails.UserDetails;
 //import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.security.crypto.codec.Hex;
 import org.springframework.stereotype.Service;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.util.Optional;
 
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
 
 @Service
 @Primary
@@ -48,8 +52,26 @@ public GetUserInfoResponseDto getUserInfo(String userId) {
 
         GetAllRoomsByUserIdUsecase.GetAllRoomsByUserIdResponseDto projects = getAllRoomsByUserIdUsecase.getAllRoomsByUserId(userId);
 
-        return new GetUserInfoResponseDto(userId, user.getName(), user.getProfileImg(), user.getEmail(), projects.projects());
+        return new GetUserInfoResponseDto(userId,hash(userId) ,user.getName(), user.getProfileImg(), user.getEmail(), projects.projects());
+
+    }
 
+    private static String hash(String input) {
+        try {
+            // SHA-256 해시 인스턴스 생성
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] hashBytes = digest.digest(input.getBytes());
+
+            // 해시 결과를 16바이트로 자르기
+            byte[] truncatedHash = new byte[8];
+            System.arraycopy(hashBytes, 0, truncatedHash, 0, 8);
+
+            // 바이트 배열을 헥사 문자열로 변환
+            char[] hexChars = Hex.encode(truncatedHash);
+            return new String(hexChars);
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("SHA-256 algorithm not found", e);
+        }
     }
 
     @Override
diff --git a/src/test/java/adaptor/in/web/ProjectControllerTest.java b/src/test/java/adaptor/in/web/ProjectControllerTest.java
index 71484fc..5f86184 100644
--- a/src/test/java/adaptor/in/web/ProjectControllerTest.java
+++ b/src/test/java/adaptor/in/web/ProjectControllerTest.java
@@ -129,7 +129,7 @@ void testInviteUser_ValidRequest() {
         setupMockJwtService(request, "token", "userId", null);
 
         InviteUserInProjectResponseDto responseDto = new InviteUserInProjectResponseDto("validProjectId");
-        when(inviteUserInProjectUsecase.inviteUserInProject(anyString(), anyString(), any())).thenReturn(responseDto);
+        when(inviteUserInProjectUsecase.inviteUserInProject(anyString(),any(), anyString(), any())).thenReturn(responseDto);
 
         InviteUserInProjectResponseDto response = projectController.inviteUser(request, requestDto);
 
@@ -305,8 +305,9 @@ private void verifyInviteUserUsecase(String expectedUserId, String expectedProje
         ArgumentCaptor<String> userIdCaptor = ArgumentCaptor.forClass(String.class);
         ArgumentCaptor<String> projectIdCaptor = ArgumentCaptor.forClass(String.class);
         ArgumentCaptor<List<String>> usersCaptor = ArgumentCaptor.forClass(List.class);
+        ArgumentCaptor<String> userNameCaptor = ArgumentCaptor.forClass(String.class);
 
-        verify(inviteUserInProjectUsecase).inviteUserInProject(userIdCaptor.capture(), projectIdCaptor.capture(), usersCaptor.capture());
+        verify(inviteUserInProjectUsecase).inviteUserInProject(userIdCaptor.capture(),userNameCaptor.capture(), projectIdCaptor.capture(), usersCaptor.capture());
 
         assertThat(userIdCaptor.getValue()).isEqualTo(expectedUserId);
         assertThat(projectIdCaptor.getValue()).isEqualTo(expectedProjectId);
diff --git a/src/test/java/adaptor/in/web/UserControllerTest.java b/src/test/java/adaptor/in/web/UserControllerTest.java
index 73ccd4c..147fa51 100644
--- a/src/test/java/adaptor/in/web/UserControllerTest.java
+++ b/src/test/java/adaptor/in/web/UserControllerTest.java
@@ -48,6 +48,7 @@ void testGetUserInfo_ValidRequest() {
         when(jwtService.getUserIdFromToken(token)).thenReturn(userId);
 
         GetUserInfoResponseDto userInfoResponseDto = new GetUserInfoResponseDto(
+                "user-id",
                 "user-id",
                 "Test User",
                 "profileImg.jpg",
diff --git a/src/test/java/application/service/ProjectServiceTest.java b/src/test/java/application/service/ProjectServiceTest.java
index d136179..e0eeb4e 100644
--- a/src/test/java/application/service/ProjectServiceTest.java
+++ b/src/test/java/application/service/ProjectServiceTest.java
@@ -155,12 +155,13 @@ void deleteProject() {
     void inviteUserInProject() {
         // Given
         String userId = Consistent.UserId.getValue();
+        String uesrName = Consistent.UserName.getValue();
         String projectId = Consistent.ProjectId.getValue();
         List<String> userEmails = Arrays.asList("user1@example.com", "user2@example.com");
 
 
         // When
-        InviteUserInProjectUsecase.InviteUserInProjectResponseDto response = projectService.inviteUserInProject(userId, projectId, userEmails);
+        InviteUserInProjectUsecase.InviteUserInProjectResponseDto response = projectService.inviteUserInProject(userId,uesrName, projectId, userEmails);
 
         // Then
         assertNotNull(response);