diff --git a/src/oebuild/check_docker_tag.py b/src/oebuild/check_docker_tag.py
index 35c43c13b71805ddfe03341fd6b759f4f49019e1..5ba23d44e5fcd8cef36b15cdb19f841bcbae2742 100644
--- a/src/oebuild/check_docker_tag.py
+++ b/src/oebuild/check_docker_tag.py
@@ -65,18 +65,18 @@ the openeuler embedded docker tag can be selected list:
             if self.docker_tag not in self.tag_list:
                 return None
             else:
-                return self.docker_tag
+                return str(self.docker_tag)
 
         yocto_dir = self.configure.source_yocto_dir()
         env_path = os.path.join(yocto_dir,".oebuild/env.yaml")
         if os.path.exists(env_path):
             env_parse = oebuild_util.read_yaml(pathlib.Path(env_path))
-            return env_parse['docker_tag']
+            return str(env_parse['docker_tag'])
 
         yocto_repo = Repo.init(yocto_dir)
         oebuild_config = self.configure.parse_oebuild_config()
         docker_config = oebuild_config.docker
         if yocto_repo.active_branch.name in docker_config.tag_map:
-            return docker_config.tag_map[yocto_repo.active_branch.name]
+            return str(docker_config.tag_map[yocto_repo.active_branch.name])
 
         return None
diff --git a/src/oebuild/ogit.py b/src/oebuild/ogit.py
index 92f1466f5b2da0beb2208220fa8394e53ba4c696..32f671256f746cd9cc000f9f530164c8a9930296 100644
--- a/src/oebuild/ogit.py
+++ b/src/oebuild/ogit.py
@@ -57,16 +57,15 @@ class OGit:
         '''
         check out version
         '''
-        repo = Repo.init(self._repo_dir)
-        try:
-            repo.git.checkout(version)
-        except GitCommandError:
-            logger.error("checkout faild")
+        self._fetch_upstream(version=version)
 
-    def clone_or_pull_repo(self,):
+    def clone_or_pull_repo(self):
         '''
         clone or pull git repo
         '''
+        self._fetch_upstream()
+
+    def _fetch_upstream(self, version=None):
         repo = Repo.init(self._repo_dir)
         remote = None
         for item in repo.remotes:
@@ -80,7 +79,10 @@ class OGit:
         logger.info("Fetching into %s ...", self._repo_dir)
         remote.fetch(progress=CustomRemote())
         try:
-            repo.git.checkout(self._branch)
+            if version is None:
+                repo.git.checkout(self._branch)
+            else:
+                repo.git.checkout(version)
         except GitCommandError:
             logger.error("update faild")
 
diff --git a/src/oebuild/version.py b/src/oebuild/version.py
index b05f40a938d03e73a745ca47e41ea43885b6725f..88dcd267f70a6e839c5cdbfeb88f36c0fd52b900 100644
--- a/src/oebuild/version.py
+++ b/src/oebuild/version.py
@@ -10,4 +10,4 @@ MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 See the Mulan PSL v2 for more details.
 '''
 
-__version__ = '0.0.31'
+__version__ = '0.0.32'