diff --git a/tools/csst-dfs-api-install.sh b/tools/csst-dfs-api-install.sh
index 65c90730d6e973b1dcc868ee8d671235dfa469b1..8a99fdfd373805ea9b669c7cdf7d8e0c5984ba38 100755
--- a/tools/csst-dfs-api-install.sh
+++ b/tools/csst-dfs-api-install.sh
@@ -1,12 +1,16 @@
 echo "CSST-DFS-API Installer"
 echo "=============================================="
 
-if [ $# != 1 ] ; then
+version=""
+if [ $# == 0 ] ; then
+version=""
+elif [ $# == 1 ] ; then
+version="@$1"
+else
 echo "USAGE: $0 [version]"
 echo " e.g.: $0 v0.0.1"
 exit 1;
 fi
-version=$1
 
 pip uninstall csst-dfs-api-local -y
 pip uninstall csst-dfs-api-cluster -y
@@ -17,14 +21,14 @@ pip uninstall csst-dfs-api -y
 echo "Installing.....Version:$version"
 echo "=============================================="
 echo "1/5"
-pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-commons.git@$version
+pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-commons.git$version
 echo "2/5"
-pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-proto-py.git@$version
+pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-proto-py.git$version
 echo "3/5"
-pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api-local.git@$version
+pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api-local.git$version
 echo "4/5"
-pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api-cluster.git@$version
+pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api-cluster.git$version
 echo "5/5"
-pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api.git@$version
+pip install git+https://hub.fastgit.org/astronomical-data-processing/csst-dfs-api.git$version
 echo "=============================================="
 echo "Done!"
\ No newline at end of file