diff --git a/kclvm/api/src/service/service_impl.rs b/kclvm/api/src/service/service_impl.rs
index 18a01a42d..6be18b2e6 100644
--- a/kclvm/api/src/service/service_impl.rs
+++ b/kclvm/api/src/service/service_impl.rs
@@ -359,7 +359,7 @@ impl KclvmServiceImpl {
     /// assert_eq!(result.variables.get("a").unwrap().value, "1");
     /// ```
     pub fn list_variables(&self, args: &ListVariablesArgs) -> anyhow::Result<ListVariablesResult> {
-        let k_files = args.files.iter().map(|s| s.as_str()).collect();
+        let k_files = args.files.clone();
         let specs = args.specs.clone();
 
         let select_res = list_variables(k_files, specs)?;
diff --git a/kclvm/query/src/selector.rs b/kclvm/query/src/selector.rs
index f6998471a..0096d61cb 100644
--- a/kclvm/query/src/selector.rs
+++ b/kclvm/query/src/selector.rs
@@ -462,10 +462,14 @@ impl Variable {
 
 /// list_options provides users with the ability to parse kcl program and get all option
 /// calling information.
-pub fn list_variables(files: Vec<&str>, specs: Vec<String>) -> Result<ListVariablesResult> {
+pub fn list_variables(files: Vec<String>, specs: Vec<String>) -> Result<ListVariablesResult> {
     let mut selector = Selector::new(specs)?;
-    // let parse_result = parse_file(&file, None)?;
-    let mut load_result = load_program(Arc::new(ParseSession::default()), &files, None, None)?;
+    let mut load_result = load_program(
+        Arc::new(ParseSession::default()),
+        &files.iter().map(AsRef::as_ref).collect::<Vec<&str>>(),
+        None,
+        None,
+    )?;
 
     let mut opts = Options::default();
     opts.merge_program = true;