diff --git a/backend/src/main/java/com/qqchen/deploy/backend/deploy/entity/RepositoryBranch.java b/backend/src/main/java/com/qqchen/deploy/backend/deploy/entity/RepositoryBranch.java
index 78fa296d..3a4b4c96 100644
--- a/backend/src/main/java/com/qqchen/deploy/backend/deploy/entity/RepositoryBranch.java
+++ b/backend/src/main/java/com/qqchen/deploy/backend/deploy/entity/RepositoryBranch.java
@@ -53,7 +53,10 @@ public class RepositoryBranch extends Entity<Long> {
     private String webUrl;
 
     @Column(name = "project_id", nullable = false)
-    private Long projectId;
+    private Long projectId;  // 我们数据库的project表的ID
+
+    @Column(name = "git_project_id", nullable = false)
+    private Long gitProjectId;  // GitLab的真实project_id
 
     @Column(name = "external_system_id", nullable = false)
     private Long externalSystemId;
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 966e1ca3..7cf138a7 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
@@ -129,9 +129,10 @@ 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());
+                        log.info("Syncing branches for project: {} (ID: {}, GitLab ID: {})", 
+                            project.getName(), project.getId(), project.getProjectId());
                         
-                        // 4.1 获取当前项目在GitLab上的所有分支
+                        // 4.1 获取当前项目在GitLab上的所有分支，使用GitLab的真实project_id
                         List<GitBranchResponse> remoteBranches = gitServiceIntegration.branches(externalSystem, project.getProjectId());
                         log.info("Found {} remote branches for project: {}", remoteBranches.size(), project.getName());
                         
@@ -167,7 +168,8 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
 
                         log.info("Completed processing {} branches for project: {}", remoteBranches.size(), project.getName());
                     } catch (Exception e) {
-                        log.error("Failed to sync branches for project: {} (ID: {})", project.getName(), project.getProjectId(), e);
+                        log.error("Failed to sync branches for project: {} (ID: {}, GitLab ID: {})", 
+                            project.getName(), project.getId(), project.getProjectId(), e);
                         throw new RuntimeException(e);
                     }
                 }, executor);
@@ -211,9 +213,14 @@ public class RepositoryBranchServiceImpl extends BaseServiceImpl<RepositoryBranc
         
         RepositoryBranch branch = existingBranchMap.getOrDefault(remoteBranch.getName(), new RepositoryBranch());
         
+        // 获取对应的RepositoryProject以获取GitLab的真实project_id
+        RepositoryProject project = repositoryProjectRepository.findById(projectId)
+            .orElseThrow(() -> new BusinessException(ResponseCode.REPOSITORY_PROJECT_NOT_FOUND));
+        
         // 更新基本信息
         branch.setExternalSystemId(externalSystemId);
-        branch.setProjectId(projectId);
+        branch.setProjectId(projectId);  // 设置我们数据库的project ID
+        branch.setGitProjectId(project.getProjectId());  // 设置GitLab的真实project ID
         branch.setName(remoteBranch.getName());
         branch.setIsDefaultBranch(remoteBranch.getIsDefaultBranch());
         branch.setCanPush(remoteBranch.getCanPush());
diff --git a/backend/src/main/resources/db/migration/V1.0.0__init_schema.sql b/backend/src/main/resources/db/migration/V1.0.0__init_schema.sql
index e7e1305e..71f74f1f 100644
--- a/backend/src/main/resources/db/migration/V1.0.0__init_schema.sql
+++ b/backend/src/main/resources/db/migration/V1.0.0__init_schema.sql
@@ -339,30 +339,33 @@ CREATE TABLE deploy_repo_branch
 (
 	-- 基础字段
 	id                   BIGINT AUTO_INCREMENT PRIMARY KEY COMMENT '主键ID',
-	create_by            VARCHAR(100) NULL COMMENT '创建人',
-	create_time          DATETIME(6) NULL COMMENT '创建时间',
-	update_by            VARCHAR(100) NULL COMMENT '更新人',
-	update_time          DATETIME(6) NULL COMMENT '更新时间',
-	version              INT          NOT NULL DEFAULT 1 COMMENT '版本号',
-	deleted              BIT          NOT NULL DEFAULT 0 COMMENT '是否删除：0-未删除，1-已删除',
-
 	-- 业务字段
 	name                 VARCHAR(100) NOT NULL COMMENT '分支名称',
-	project_id           BIGINT       NOT NULL COMMENT '所属项目ID',
-	external_system_id   BIGINT       NOT NULL COMMENT '外部系统ID',
 	is_default_branch    BIT                   DEFAULT 0 COMMENT '是否为默认分支：0-否，1-是',
 	can_push             BIT                   DEFAULT 1 COMMENT '是否可推送：0-否，1-是',
 	developers_can_push  BIT                   DEFAULT 1 COMMENT '开发者是否可推送：0-否，1-是',
 	developers_can_merge BIT                   DEFAULT 1 COMMENT '开发者是否可合并：0-否，1-是',
-	commit_id            VARCHAR(64) NULL COMMENT '最新提交ID',
-	commit_message       TEXT NULL COMMENT '最新提交信息',
+	commit_id            VARCHAR(64)  NULL COMMENT '最新提交ID',
+	commit_message       TEXT         NULL COMMENT '最新提交信息',
 	commit_author        VARCHAR(100) NULL COMMENT '最新提交作者',
-	commit_date          DATETIME(6) NULL COMMENT '最新提交时间',
-	last_update_time     DATETIME(6) NULL COMMENT '分支最后更新时间',
-	last_commit_time     DATETIME(6) NULL COMMENT '分支最后提交时间',
-	web_url              VARCHAR(255) NULL COMMENT '网页URL'
+	commit_date          DATETIME(6)  NULL COMMENT '最新提交时间',
+	last_update_time     DATETIME(6)  NULL COMMENT '分支最后更新时间',
+	last_commit_time     DATETIME(6)  NULL COMMENT '分支最后提交时间',
+	web_url              VARCHAR(255) NULL COMMENT '网页URL',
+	project_id           BIGINT       NOT NULL COMMENT '所属项目ID',
+	external_system_id   BIGINT       NOT NULL COMMENT '外部系统ID',
+	git_project_id       BIGINT       NOT NULL COMMENT 'GitLab的真实project_id',
 
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='代码仓库分支表';
+	create_by            VARCHAR(100) NULL COMMENT '创建人',
+	create_time          DATETIME(6)  NULL COMMENT '创建时间',
+	update_by            VARCHAR(100) NULL COMMENT '更新人',
+	update_time          DATETIME(6)  NULL COMMENT '更新时间',
+	version              INT          NOT NULL DEFAULT 1 COMMENT '版本号',
+	deleted              BIT          NOT NULL DEFAULT 0 COMMENT '是否删除：0-未删除，1-已删除'
+
+) ENGINE = InnoDB
+  DEFAULT CHARSET = utf8mb4
+  COLLATE = utf8mb4_unicode_ci COMMENT ='代码仓库分支表';
 
 -- --------------------------------------------------------------------------------------
 -- 工作流相关表