diff --git a/backend/src/main/java/com/qqchen/deploy/backend/deploy/integration/impl/GitServiceIntegrationImpl.java b/backend/src/main/java/com/qqchen/deploy/backend/deploy/integration/impl/GitServiceIntegrationImpl.java
index 33ea1ecb..397b2820 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/deploy/integration/impl/GitServiceIntegrationImpl.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/deploy/integration/impl/GitServiceIntegrationImpl.java
@@ -119,7 +119,7 @@ public class GitServiceIntegrationImpl implements IGitServiceIntegration {
     @Override
     public List<GitBranchResponse> branches(ExternalSystem system, Long projectId) {
         try {
-            String url = String.format("%s/api/v4/projects/%d/repository/branches", system.getUrl(), projectId);
+            String url = String.format("%s/api/v4/projects/%d/repository/branches?per_page=100", system.getUrl(), projectId);
             HttpHeaders headers = createHeaders(system);
             HttpEntity<String> entity = new HttpEntity<>(headers);
 
@@ -130,8 +130,7 @@ public class GitServiceIntegrationImpl implements IGitServiceIntegration {
                 entity,
                 String.class
             );
-            log.info("First branch from GitLab API: {}", 
-                rawResponse.getBody() != null ? rawResponse.getBody().split("},")[0] + "}" : null);
+            log.info("GitLab API response for branches: {}", rawResponse.getBody());
 
             // 然后解析为对象
             ResponseEntity<List<GitBranchResponse>> response = restTemplate.exchange(
@@ -141,7 +140,14 @@ public class GitServiceIntegrationImpl implements IGitServiceIntegration {
                 new ParameterizedTypeReference<>() {}
             );
 
-            return response.getBody() != null ? response.getBody() : Collections.emptyList();
+            List<GitBranchResponse> branches = response.getBody();
+            if (branches != null && !branches.isEmpty()) {
+                log.info("Found {} branches, first branch: {}", branches.size(), branches.get(0).getName());
+            } else {
+                log.warn("No branches found for project: {}", projectId);
+            }
+
+            return branches != null ? branches : Collections.emptyList();
         } catch (Exception e) {
             log.error("Failed to fetch git branches for system: {} and project: {}", system.getName(), projectId, e);
             return Collections.emptyList();
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/deploy/service/impl/RepositoryBranchServiceImpl.java b/backend/src/main/java/com/qqchen/deploy/backend/deploy/service/impl/RepositoryBranchServiceImpl.java
index a53fba85..966e1ca3 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/deploy/service/impl/RepositoryBranchServiceImpl.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/deploy/service/impl/RepositoryBranchServiceImpl.java
@@ -110,6 +110,7 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
             // 2. 获取外部系统信息
             ExternalSystem externalSystem = externalSystemRepository.findById(externalSystemId)
                 .orElseThrow(() -> new BusinessException(ResponseCode.EXTERNAL_SYSTEM_NOT_FOUND));
+            log.info("Starting branch sync for external system: {} (ID: {})", externalSystem.getName(), externalSystemId);
 
             // 3. 获取所有项目
             List<RepositoryProject> projects = repositoryProjectRepository.findByExternalSystemIdAndDeletedFalse(externalSystemId);
@@ -118,6 +119,7 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
                 repositorySyncHistoryService.updateSyncHistory(syncHistory.getId(), ExternalSystemSyncStatus.SUCCESS, null);
                 return 0;
             }
+            log.info("Found {} projects to sync", projects.size());
 
             AtomicInteger totalSyncedBranches = new AtomicInteger(0);
             List<CompletableFuture<Void>> futures = new ArrayList<>();
@@ -127,17 +129,24 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
             for (RepositoryProject project : projects) {
                 CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {
                     try {
+                        log.info("Syncing branches for project: {} (ID: {})", project.getName(), project.getProjectId());
+                        
                         // 4.1 获取当前项目在GitLab上的所有分支
                         List<GitBranchResponse> remoteBranches = gitServiceIntegration.branches(externalSystem, project.getProjectId());
+                        log.info("Found {} remote branches for project: {}", remoteBranches.size(), project.getName());
+                        
                         Set<String> remoteBranchNames = remoteBranches.stream()
                             .map(GitBranchResponse::getName)
                             .collect(Collectors.toSet());
+                        log.info("Remote branch names: {}", remoteBranchNames);
 
                         // 4.2 获取数据库中的所有分支
                         Map<String, RepositoryBranch> existingBranchMap = repositoryBranchRepository
                             .findByExternalSystemIdAndProjectIdAndDeletedFalse(externalSystemId, project.getId())
                             .stream()
                             .collect(Collectors.toMap(RepositoryBranch::getName, Function.identity()));
+                        log.info("Found {} existing branches in database for project: {}", existingBranchMap.size(), project.getName());
+                        log.info("Existing branch names: {}", existingBranchMap.keySet());
 
                         // 4.3 处理所有远程分支（新增或更新）
                         for (GitBranchResponse remoteBranch : remoteBranches) {
@@ -145,6 +154,7 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
                             branchesToSave.add(branch);
                             totalSyncedBranches.incrementAndGet();
                             existingBranchMap.remove(remoteBranch.getName());
+                            log.info("Processed remote branch: {}", remoteBranch.getName());
                         }
 
                         // 4.4 处理已删除的分支
@@ -152,11 +162,12 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
                             branch.setDeleted(true);
                             branchesToSave.add(branch);
                             totalSyncedBranches.incrementAndGet();
+                            log.info("Marked branch as deleted: {}", branchName);
                         });
 
-                        log.info("Processed {} branches for project: {}", remoteBranches.size(), project.getName());
+                        log.info("Completed processing {} branches for project: {}", remoteBranches.size(), project.getName());
                     } catch (Exception e) {
-                        log.error("Failed to sync branches for project: {}", project.getName(), e);
+                        log.error("Failed to sync branches for project: {} (ID: {})", project.getName(), project.getProjectId(), e);
                         throw new RuntimeException(e);
                     }
                 }, executor);
@@ -170,6 +181,7 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
             // 批量保存分支
             if (!branchesToSave.isEmpty()) {
                 try {
+                    log.info("Saving {} branches to database", branchesToSave.size());
                     saveBatch(branchesToSave);
                 } catch (Exception e) {
                     log.error("Error saving branches in batch", e);
@@ -180,11 +192,12 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
             // 5. 更新同步历史为成功
             repositorySyncHistoryService.updateSyncHistory(syncHistory.getId(), ExternalSystemSyncStatus.SUCCESS, null);
 
-            log.info("Successfully synchronized total {} branches for external system: {}", 
+            log.info("Successfully synchronized {} branches for external system: {}", 
                 totalSyncedBranches.get(), externalSystem.getName());
             return totalSyncedBranches.get();
         } catch (Exception e) {
             // 6. 更新同步历史为失败
+            log.error("Failed to sync branches", e);
             repositorySyncHistoryService.updateSyncHistory(syncHistory.getId(), ExternalSystemSyncStatus.FAILED, e.getMessage());
             throw new BusinessException(ResponseCode.REPOSITORY_BRANCH_SYNC_FAILED);
         }