diff --git a/components/vc-tree-select/hooks/useTreeData.ts b/components/vc-tree-select/hooks/useTreeData.ts
index d3ddccb5b2..e2d1796b32 100644
--- a/components/vc-tree-select/hooks/useTreeData.ts
+++ b/components/vc-tree-select/hooks/useTreeData.ts
@@ -63,7 +63,7 @@ export default function useTreeData(
               rootPId: null,
               ...(simpleModeValue !== true ? simpleModeValue : {}),
             })
-          : toRaw(treeData.value);
+          : toRaw(treeData.value).slice();
       } else {
         mergedTreeData.value = convertChildrenToData(toRaw(children.value));
       }
diff --git a/components/vc-tree/Tree.tsx b/components/vc-tree/Tree.tsx
index 46b58d6dad..78b0fde959 100644
--- a/components/vc-tree/Tree.tsx
+++ b/components/vc-tree/Tree.tsx
@@ -109,7 +109,7 @@ export default defineComponent({
       () => {
         treeData.value =
           props.treeData !== undefined
-            ? toRaw(props.treeData)
+            ? toRaw(props.treeData).slice()
             : convertTreeToData(toRaw(props.children));
       },
       { immediate: true, deep: true },