diff --git a/before_ut.bat b/before_ut.bat
index fcf4ef2df614147ecf5ed270293c7c4a15297f90..abe7fc250ef44bf01396ae20c4dacc9db3f60ce2 100644
--- a/before_ut.bat
+++ b/before_ut.bat
@@ -14,18 +14,24 @@
 ::  See the License for the specific language governing permissions and
 ::  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%
+set zkJarName="zookeeper-3.4.9-fatjar.jar"
+set remoteJarUrl="https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar/%zkJarName%"
+set zkJarPath="remoting/zookeeper/zookeeper-4unittest/contrib/fatjar"
+set zkJar="%zkJarPath%/%zkJarName%"
+
+if not exist "%zkJar%" (
+   md %zkJarPath%
+   curl -L %remoteJarUrl% -o %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/"
+xcopy /f "%zkJar%" "config_center/zookeeper/zookeeper-4unittest/contrib/fatjar/"
 
 md registry\zookeeper\zookeeper-4unittest\contrib\fatjar
-xcopy /f "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%" "registry/zookeeper/zookeeper-4unittest/contrib/fatjar/"
+xcopy /f "%zkJar%" "registry/zookeeper/zookeeper-4unittest/contrib/fatjar/"
 
 md cluster\router\chain\zookeeper-4unittest\contrib\fatjar
-xcopy /f "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%" "cluster/router/chain/zookeeper-4unittest/contrib/fatjar/"
+xcopy /f "%zkJar%" "cluster/router/chain/zookeeper-4unittest/contrib/fatjar/"
 
 md cluster\router\condition\zookeeper-4unittest\contrib\fatjar
-xcopy /f "remoting/zookeeper/zookeeper-4unittest/contrib/fatjar/%zkJar%" "cluster/router/condition/zookeeper-4unittest/contrib/fatjar/"
\ No newline at end of file
+xcopy /f "%zkJar%" "cluster/router/condition/zookeeper-4unittest/contrib/fatjar/"
\ No newline at end of file
diff --git a/before_ut.sh b/before_ut.sh
index c6559cba31310a9957259cd9619eb42977649edd..7ee92e57a26cbdbb1d1a0b3e792726ad5e1954f8 100755
--- a/before_ut.sh
+++ b/before_ut.sh
@@ -14,18 +14,24 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
+zkJarName="zookeeper-3.4.9-fatjar.jar"
+remoteJarUrl="https://github.com/dubbogo/resources/raw/master/zookeeper-4unitest/contrib/fatjar/${zkJarName}"
+zkJarPath="remoting/zookeeper/zookeeper-4unittest/contrib/fatjar"
+zkJar="${zkJarPath}/${zkJarName}"
 
-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 "${zkJar}" ]; then
+    mkdir -p ${zkJarPath}
+    wget -P "${zkJarPath}" ${remoteJarUrl}
+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 ${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 ${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 ${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 ${zkJar} cluster/router/condition/zookeeper-4unittest/contrib/fatjar
\ No newline at end of file