diff --git a/src/components/__tests__/GroupNode.test.tsx b/src/components/__tests__/GroupNode.test.tsx
index e4ba178f..7ec7289f 100644
--- a/src/components/__tests__/GroupNode.test.tsx
+++ b/src/components/__tests__/GroupNode.test.tsx
@@ -38,12 +38,18 @@ vi.mock("@xyflow/react", async () => {
     }) => (isVisible ? <div data-testid="node-toolbar">{children}</div> : null),
     NodeResizer: ({
       isVisible,
+      minWidth,
+      minHeight,
     }: {
       isVisible: boolean;
+      minWidth: number;
+      minHeight: number;
     }) => (
       <div
         data-testid="node-resizer"
         data-visible={isVisible}
+        data-min-width={minWidth}
+        data-min-height={minHeight}
       />
     ),
     NodeResizeControl: ({
@@ -142,6 +148,39 @@ describe("GroupNode", () => {
     expect(screen.getByTestId("group-resize-corner")).toHaveAttribute("title", "缩放分组");
   });
 
+  it("keeps resize minimums large enough to contain grouped nodes", () => {
+    mockUseWorkflowStore.mockReturnValue({
+      groups: { "group-1": defaultGroup },
+      nodes: [
+        {
+          id: "node-1",
+          type: "prompt",
+          position: { x: 260, y: 140 },
+          style: { width: 180, height: 90 },
+          groupId: "group-1",
+        },
+      ],
+      edges: [],
+      onNodesChange: mockOnNodesChange,
+      updateGroup: mockUpdateGroup,
+      deleteGroup: mockDeleteGroup,
+      runGroup: mockRunGroup,
+      cancelGroupTask: mockCancelGroupTask,
+      runningGroupIds: new Set<string>(),
+    });
+
+    render(
+      <TestWrapper>
+        <GroupNode {...createNodeProps()} />
+      </TestWrapper>
+    );
+
+    expect(screen.getByTestId("node-resizer")).toHaveAttribute("data-min-width", "460");
+    expect(screen.getByTestId("node-resizer")).toHaveAttribute("data-min-height", "250");
+    expect(screen.getByTestId("node-resize-control")).toHaveAttribute("data-min-width", "460");
+    expect(screen.getByTestId("node-resize-control")).toHaveAttribute("data-min-height", "250");
+  });
+
   it("returns null when group metadata is missing", () => {
     mockUseWorkflowStore.mockReturnValue({
       groups: {},
diff --git a/src/components/nodes/GroupNode.tsx b/src/components/nodes/GroupNode.tsx
index 561ecfcf..48c2f023 100644
--- a/src/components/nodes/GroupNode.tsx
+++ b/src/components/nodes/GroupNode.tsx
@@ -36,6 +36,9 @@ const LAYOUT_OPTIONS: { layout: GroupLayout; labelKey: TranslationKey }[] = [
 ];
 
 const STACK_GAP = 20;
+const GROUP_MIN_WIDTH = 200;
+const GROUP_MIN_HEIGHT = 120;
+const GROUP_CHILD_PADDING = 20;
 
 function getNodeSize(node: FlowNode) {
   return {
@@ -177,6 +180,57 @@ export function GroupNode({ id, data, selected }: NodeProps<GroupNodeType>) {
     [edges, groupId, nodes]
   );
 
+  const groupMemberNodes = useMemo(
+    () => nodes.filter((node) => node.type !== "group" && (node.groupId === groupId || node.parentId === id)),
+    [groupId, id, nodes]
+  );
+
+  const resizeBounds = useMemo(() => {
+    let minWidth = GROUP_MIN_WIDTH;
+    let minHeight = GROUP_MIN_HEIGHT;
+    let maxRight = 0;
+    let maxBottom = 0;
+
+    groupMemberNodes.forEach((node) => {
+      const { width, height } = getNodeSize(node);
+      maxRight = Math.max(maxRight, node.position.x + width);
+      maxBottom = Math.max(maxBottom, node.position.y + height);
+    });
+
+    if (groupMemberNodes.length > 0) {
+      minWidth = Math.max(minWidth, Math.ceil(maxRight + GROUP_CHILD_PADDING));
+      minHeight = Math.max(minHeight, Math.ceil(maxBottom + GROUP_CHILD_PADDING));
+    }
+
+    return { minWidth, minHeight };
+  }, [groupMemberNodes]);
+
+  const shouldResizeGroup = useCallback(
+    (_event: unknown, params: { x: number; y: number; width: number; height: number }) => {
+      if (!group) return true;
+      if (groupMemberNodes.length === 0) return true;
+
+      const right = params.x + params.width;
+      const bottom = params.y + params.height;
+
+      return groupMemberNodes.every((node) => {
+        const { width, height } = getNodeSize(node);
+        const nodeLeft = group.position.x + node.position.x;
+        const nodeTop = group.position.y + node.position.y;
+        const nodeRight = nodeLeft + width;
+        const nodeBottom = nodeTop + height;
+
+        return (
+          nodeLeft >= params.x &&
+          nodeTop >= params.y &&
+          nodeRight <= right &&
+          nodeBottom <= bottom
+        );
+      });
+    },
+    [group, groupMemberNodes]
+  );
+
   const handleBatchDownload = useCallback(
     async (event: React.MouseEvent) => {
       event.stopPropagation();
@@ -373,15 +427,17 @@ export function GroupNode({ id, data, selected }: NodeProps<GroupNodeType>) {
 
       <NodeResizer
         isVisible={showResizeControls}
-        minWidth={200}
-        minHeight={120}
+        minWidth={resizeBounds.minWidth}
+        minHeight={resizeBounds.minHeight}
+        shouldResize={shouldResizeGroup}
         lineClassName="!border-neutral-400/40"
         handleClassName="!h-5 !w-5 !border-none !bg-transparent !p-0"
       />
       <NodeResizeControl
         position="bottom-right"
-        minWidth={200}
-        minHeight={120}
+        minWidth={resizeBounds.minWidth}
+        minHeight={resizeBounds.minHeight}
+        shouldResize={shouldResizeGroup}
         className="group-resize-corner-control nodrag nopan nowheel"
       >
         <div
diff --git a/src/store/__tests__/workflowStore.integration.test.ts b/src/store/__tests__/workflowStore.integration.test.ts
index 2ccdb7c0..be3e5d52 100644
--- a/src/store/__tests__/workflowStore.integration.test.ts
+++ b/src/store/__tests__/workflowStore.integration.test.ts
@@ -2997,6 +2997,8 @@ describe("workflowStore integration tests", () => {
         regroupedNodes.forEach((node) => {
           expect(node.groupId).toBe(secondGroupId);
           expect(node.parentId).toBe(`group-node-${secondGroupId}`);
+          expect(node.extent).toBeUndefined();
+          expect(node.expandParent).toBeUndefined();
         });
       });
     });
@@ -3049,9 +3051,13 @@ describe("workflowStore integration tests", () => {
         store.addNodesToGroup(["ease-1", "vs-1", "audio-1"], "group-1");
 
         const nodes = useWorkflowStore.getState().nodes;
-        expect(nodes.find((n) => n.id === "ease-1")?.groupId).toBe("group-1");
-        expect(nodes.find((n) => n.id === "vs-1")?.groupId).toBe("group-1");
-        expect(nodes.find((n) => n.id === "audio-1")?.groupId).toBe("group-1");
+        ["ease-1", "vs-1", "audio-1"].forEach((nodeId) => {
+          const node = nodes.find((n) => n.id === nodeId);
+          expect(node?.groupId).toBe("group-1");
+          expect(node?.parentId).toBe("group-node-group-1");
+          expect(node?.extent).toBeUndefined();
+          expect(node?.expandParent).toBeUndefined();
+        });
       });
 
     });
diff --git a/src/store/workflowStore.ts b/src/store/workflowStore.ts
index 3cb15ead..05d54035 100644
--- a/src/store/workflowStore.ts
+++ b/src/store/workflowStore.ts
@@ -630,17 +630,16 @@ function normalizeNativeGroupNodes(
 
       if (
         !isAlreadyNativeChild ||
-        node.extent !== "parent" ||
-        node.expandParent !== true
+        node.extent !== undefined ||
+        node.expandParent !== undefined
       ) {
         changed = true;
       }
 
+      const { extent: _extent, expandParent: _expandParent, ...nodeWithoutDragBounds } = node;
       return {
-        ...node,
+        ...nodeWithoutDragBounds,
         parentId: groupNodeId,
-        extent: "parent",
-        expandParent: true,
         groupId,
         position: nextPosition,
         selected: false,
@@ -1682,11 +1681,10 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
         ...state.nodes.filter((node) => !selectedGroupNodeIds.has(node.id)).map((node) => {
           if (!selectedIds.has(node.id)) return node;
           const absolutePosition = absolutePositionByNodeId.get(node.id) ?? getAbsoluteNodePosition(node, nodeById);
+          const { extent: _extent, expandParent: _expandParent, ...nodeWithoutDragBounds } = node;
           return {
-            ...node,
+            ...nodeWithoutDragBounds,
             parentId: groupNode.id,
-            extent: "parent",
-            expandParent: true,
             groupId: id,
             position: {
               x: absolutePosition.x - newGroup.position.x,
@@ -1741,11 +1739,10 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
         if (!group || node.type === "group" || !nodeIds.includes(node.id)) return node;
         const nodeById = new Map(state.nodes.map((n) => [n.id, n]));
         const absolutePosition = getAbsoluteNodePosition(node, nodeById);
+        const { extent: _extent, expandParent: _expandParent, ...nodeWithoutDragBounds } = node;
         return {
-          ...node,
+          ...nodeWithoutDragBounds,
           parentId: groupNodeId,
-          extent: "parent",
-          expandParent: true,
           groupId,
           position: {
             x: absolutePosition.x - group.position.x,