diff --git a/bin/run-fs-benchmark.sh b/bin/run-fs-benchmark.sh
index 8eb0781106..e446d2fb4e 100755
--- a/bin/run-fs-benchmark.sh
+++ b/bin/run-fs-benchmark.sh
@@ -47,12 +47,17 @@ if [[ "${MAX_FILE_COUNT}" -lt 65536 ]]; then
 fi
 
 # add java libs
-for f in "${DORIS_HOME}/lib/java_extensions"/*.jar; do
-    if [[ -z "${DORIS_CLASSPATH}" ]]; then
-        export DORIS_CLASSPATH="${f}"
-    else
-        export DORIS_CLASSPATH="${f}:${DORIS_CLASSPATH}"
-    fi
+preload_jars=("preload-extensions")
+preload_jars+=("java-udf")
+
+for preload_jar_dir in "${preload_jars[@]}"; do
+    for f in "${DORIS_HOME}/lib/java_extensions/${preload_jar_dir}"/*.jar; do
+        if [[ -z "${DORIS_CLASSPATH}" ]]; then
+            export DORIS_CLASSPATH="${f}"
+        else
+            export DORIS_CLASSPATH="${DORIS_CLASSPATH}:${f}"
+        fi
+    done
 done
 
 if [[ -d "${DORIS_HOME}/lib/hadoop_hdfs/" ]]; then
@@ -71,6 +76,13 @@ if [[ -d "${DORIS_HOME}/lib/hadoop_hdfs/" ]]; then
     done
 fi
 
+# add custome_libs to CLASSPATH
+if [[ -d "${DORIS_HOME}/custom_lib" ]]; then
+    for f in "${DORIS_HOME}/custom_lib"/*.jar; do
+        DORIS_CLASSPATH="${DORIS_CLASSPATH}:${f}"
+    done
+fi
+
 if [[ -n "${HADOOP_CONF_DIR}" ]]; then
     export DORIS_CLASSPATH="${DORIS_CLASSPATH}:${HADOOP_CONF_DIR}"
 fi