diff --git a/sync/git_sync.py b/sync/git_sync.py
index d40c797..f34dd6d 100644
--- a/sync/git_sync.py
+++ b/sync/git_sync.py
@@ -155,8 +155,11 @@ class GitSync(BaseSync):
             # 获取当前仓库所有文件的blob SHA
             current_file_shas = git_tool.get_all_file_shas()
             
-            # 从ChromaDB获取已处理的文件SHA
-            processed_file_shas = self._get_processed_file_shas_from_chroma()
+            # 从ChromaDB获取已处理的文件SHA（使用git_tool的repo_id和branch）
+            processed_file_shas = self._get_processed_file_shas_from_chroma(
+                repo_id=git_tool.repo_id,
+                branch=git_tool.branch
+            )
             
             # 识别需要处理的新文件/修改文件
             files_to_process = []
@@ -194,8 +197,15 @@ class GitSync(BaseSync):
         logger.info(f"获取到 {len(func_list)} 个函数")
         return func_list
     
-    def _get_processed_file_shas_from_chroma(self, collection_key: str = 'default') -> Dict[str, str]:
-        """从ChromaDB获取已处理的文件SHA映射"""
+    def _get_processed_file_shas_from_chroma(self, repo_id: str = None, branch: str = None, collection_key: str = 'default') -> Dict[str, str]:
+        """
+        从ChromaDB获取已处理的文件SHA映射
+        
+        Args:
+            repo_id: 仓库ID（可选，不传则使用config.name）
+            branch: 分支名（可选，不传则使用config.branch）
+            collection_key: Collection key
+        """
         try:
             if not self.vector_store_manager:
                 return {}
@@ -205,14 +215,22 @@ class GitSync(BaseSync):
                 logger.warning(f"Collection {collection_key} not initialized")
                 return {}
             
-            results = collection.get(
-                where={
+            # 使用传入的参数或默认值
+            query_repo_id = repo_id if repo_id else self.config.name
+            query_branch = branch if branch else getattr(self.config, 'branch', None)
+            
+            # 构建查询条件
+            if query_branch:
+                where_clause = {
                     "$and": [
-                        {"repo_id": {"$eq": self.config.name}},
-                        {"branch": {"$eq": self.config.branch}}
+                        {"repo_id": {"$eq": query_repo_id}},
+                        {"branch": {"$eq": query_branch}}
                     ]
                 }
-            )
+            else:
+                where_clause = {"repo_id": {"$eq": query_repo_id}}
+            
+            results = collection.get(where=where_clause)
             
             processed_shas = {}
             for metadata in results.get('metadatas', []):
@@ -221,6 +239,7 @@ class GitSync(BaseSync):
                     blob_sha = metadata['file_blob_sha']
                     processed_shas[file_path] = blob_sha
             
+            logger.debug(f"从ChromaDB获取到 {len(processed_shas)} 个已处理文件SHA (repo_id: {query_repo_id}, branch: {query_branch})")
             return processed_shas
         except Exception as e:
             logger.warning(f"从ChromaDB获取已处理文件SHA失败: {e}")