diff --git a/before_ut.bat b/before_ut.bat
index fcf4ef2df614147ecf5ed270293c7c4a15297f90..a6b0dff676af8f7ffde9abc3a7993f5920042580 100644
--- a/before_ut.bat
+++ b/before_ut.bat
@@ -15,8 +15,10 @@
 ::  limitations under the License.
 
 set zkJar=zookeeper-3.4.9-fatjar.jar
-md remoting\zookeeper\zookeeper-4unittest\contrib\fatjar
-curl -L https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar/%zkJar% -o remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%
+if not exist "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%" (
+   md remoting\zookeeper\zookeeper-4unittest\contrib\fatjar
+   curl -L https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar/%zkJar% -o remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%
+)
 
 md config_center\zookeeper\zookeeper-4unittest\contrib\fatjar
 xcopy /f "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%" "config_center/zookeeper/zookeeper-4unittest/contrib/fatjar/"
diff --git a/before_ut.sh b/before_ut.sh
index c6559cba31310a9957259cd9619eb42977649edd..3a958e0dd60d644c2d59f05154a5e622d91917dc 100755
--- a/before_ut.sh
+++ b/before_ut.sh
@@ -14,18 +14,21 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
+zkJar="zookeeper-3.4.9-fatjar.jar"
 
-mkdir -p remoting/zookeeper/zookeeper-4unittest/contrib/fatjar
-wget -P "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar" https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar/zookeeper-3.4.9-fatjar.jar
+if [ ! -f "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/${zkJar}" ]; then
+    mkdir -p remoting/zookeeper/zookeeper-4unittest/contrib/fatjar
+    wget -P "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar" https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar${zkJar}
+fi
 
 mkdir -p config_center/zookeeper/zookeeper-4unittest/contrib/fatjar
-cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/zookeeper-3.4.9-fatjar.jar config_center/zookeeper/zookeeper-4unittest/contrib/fatjar/
+cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/${zkJar} config_center/zookeeper/zookeeper-4unittest/contrib/fatjar/
 
 mkdir -p registry/zookeeper/zookeeper-4unittest/contrib/fatjar
-cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/zookeeper-3.4.9-fatjar.jar registry/zookeeper/zookeeper-4unittest/contrib/fatjar/
+cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/${zkJar} registry/zookeeper/zookeeper-4unittest/contrib/fatjar/
 
 mkdir -p cluster/router/chain/zookeeper-4unittest/contrib/fatjar
-cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/zookeeper-3.4.9-fatjar.jar cluster/router/chain/zookeeper-4unittest/contrib/fatjar
+cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/${zkJar} cluster/router/chain/zookeeper-4unittest/contrib/fatjar
 
 mkdir -p cluster/router/condition/zookeeper-4unittest/contrib/fatjar
-cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/zookeeper-3.4.9-fatjar.jar cluster/router/condition/zookeeper-4unittest/contrib/fatjar
\ No newline at end of file
+cp remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/${zkJar} cluster/router/condition/zookeeper-4unittest/contrib/fatjar
\ No newline at end of file