diff --git a/tests/parallel_test/run_case.sh b/tests/parallel_test/run_case.sh
index 3bea47d85f..ffc23ba6d2 100755
--- a/tests/parallel_test/run_case.sh
+++ b/tests/parallel_test/run_case.sh
@@ -81,13 +81,6 @@ pip3 list|grep taospy
 pip3 uninstall taospy -y
 pip3 install taospy==2.7.6
 
-apt install -y python3 python3-dev python3-venv
-/usr/bin/python3 -m venv /udfenv
-source /udfenv/bin/activate
-pip3 install taospyudf
-ldconfig
-deactivate
-
 $TIMEOUT_CMD $cmd
 RET=$?
 echo "cmd exit code: $RET"
diff --git a/tests/script/sh/prepare_pyudf.sh b/tests/script/sh/prepare_pyudf.sh
new file mode 100644
index 0000000000..d9cb161897
--- /dev/null
+++ b/tests/script/sh/prepare_pyudf.sh
@@ -0,0 +1,15 @@
+set +e
+
+FILE=/usr/local/lib/libtaospyudf.so
+if [ ! -f "$FILE" ]; then
+    echo "$FILE does not exist."
+    apt install -y python3 python3-dev python3-venv
+    /usr/bin/python3 -m venv /udfenv
+    source /udfenv/bin/activate
+    pip3 install taospyudf
+    ldconfig
+    deactivate
+else
+    echo "show dependencies of $FILE"
+    ldd $FILE
+fi
diff --git a/tests/script/tsim/query/udfpy.sim b/tests/script/tsim/query/udfpy.sim
index 12ac07e981..7a5aa863cf 100644
--- a/tests/script/tsim/query/udfpy.sim
+++ b/tests/script/tsim/query/udfpy.sim
@@ -11,6 +11,7 @@ sql connect
 
 print ======== step1 udf
 system sh/compile_udf.sh
+system sh/prepare_pyudf.sh
 system mkdir -p /tmp/pyudf
 system cp sh/pybitand.py /tmp/pyudf/
 system cp sh/pyl2norm.py /tmp/pyudf/