diff --git a/packages/element3/src/components/Tree/src/TreeMain.vue b/packages/element3/src/components/Tree/src/TreeMain.vue
index 95046ba90..7b12e29c3 100644
--- a/packages/element3/src/components/Tree/src/TreeMain.vue
+++ b/packages/element3/src/components/Tree/src/TreeMain.vue
@@ -40,7 +40,8 @@ export default {
     accordion: Boolean,
     autoExpandParent: { type: Boolean, default: true },
     expandOnClickNode: { type: Boolean, default: true },
-    expanded: { type: Array as PropType<ID[]>, default: () => [] }
+    expanded: { type: Array as PropType<ID[]>, default: () => [] },
+    defaultExpandAll: Boolean
   },
   emits: ['update:modelValue', 'update:checked', 'update:expanded'],
   setup(props, ctx) {
@@ -64,6 +65,9 @@ export default {
       ctx.emit('update:checked', tree.getCheckedIds())
     })
 
+    if (props.defaultExpandAll) {
+      tree.expandAll()
+    }
     watchEffect(
       () => {
         tree.expandNodeByIds(props.expanded)
diff --git a/packages/element3/src/components/Tree/src/entity/Tree.ts b/packages/element3/src/components/Tree/src/entity/Tree.ts
index ec486cece..77da5a0ff 100644
--- a/packages/element3/src/components/Tree/src/entity/Tree.ts
+++ b/packages/element3/src/components/Tree/src/entity/Tree.ts
@@ -88,4 +88,10 @@ export class Tree<RawNode extends RawNodeBase> {
 
     return ids
   }
+
+  expandAll(v = true): void {
+    this.root.depthEach((currentNode) => {
+      currentNode.expand(v, false)
+    })
+  }
 }
diff --git a/packages/element3/src/components/Tree/tests/entity/Tree.spec.ts b/packages/element3/src/components/Tree/tests/entity/Tree.spec.ts
index 4a3a9a74f..a8e621163 100644
--- a/packages/element3/src/components/Tree/tests/entity/Tree.spec.ts
+++ b/packages/element3/src/components/Tree/tests/entity/Tree.spec.ts
@@ -33,4 +33,42 @@ describe('Tree.ts', () => {
       rawNodes[0].childs[0].key
     )
   })
+
+  it('expand all node', () => {
+    type RawNode = { key: number; text: string; childs?: RawNode[] }
+    const rawNodes: RawNode[] = [
+      {
+        key: 1,
+        text: 'Node1',
+        childs: [
+          {
+            key: 11,
+            text: 'Node011'
+          }
+        ]
+      },
+      {
+        key: 2,
+        text: 'Node2',
+        childs: [
+          {
+            key: 21,
+            text: 'Node021'
+          }
+        ]
+      }
+    ]
+
+    const tree = new Tree(rawNodes, {
+      id: 'key',
+      label: 'text',
+      children: 'childs'
+    })
+
+    tree.expandAll(true)
+
+    expect(tree.root.isExpanded).toBeTruthy()
+    expect(tree.root.findOne(1).isExpanded).toBeTruthy()
+    expect(tree.root.findOne(2).isExpanded).toBeTruthy()
+  })
 })
diff --git a/packages/website/src/play/index.vue b/packages/website/src/play/index.vue
index db237e85e..094658529 100644
--- a/packages/website/src/play/index.vue
+++ b/packages/website/src/play/index.vue
@@ -7,6 +7,7 @@
     :accordion="false"
     :checkOnClickNode="false"
     :checkStrictly="false"
+    :defaultExpandAll="true"
     :defaultNodeKey="{
       isDisabled: 'disabled'
     }"