diff --git a/src/views/system/role/modules/role-resource-panel.vue b/src/views/system/role/modules/role-resource-panel.vue
index 6c2cd9d..afb6e3c 100644
--- a/src/views/system/role/modules/role-resource-panel.vue
+++ b/src/views/system/role/modules/role-resource-panel.vue
@@ -1,9 +1,10 @@
 <script setup lang="ts">
-import { computed, ref, watch } from 'vue';
+import { computed, nextTick, ref, watch } from 'vue';
 import type { TreeInstance } from 'element-plus';
 import { menuTypeRecord } from '@/constants/business';
 import { fetchAssignRoleMenus, fetchGetRoleMenuIds } from '@/service/api';
 import { $t } from '@/locales';
+import { resolveRoleMenuSubmitIds } from './role-resource-tree';
 
 defineOptions({ name: 'RoleResourcePanel' });
 
@@ -26,6 +27,8 @@ const permissionLoading = ref(false);
 const submitting = ref(false);
 const filterKeyword = ref('');
 const checkedKeys = ref<string[]>([]);
+const baselineMenuIds = ref<string[]>([]);
+const dirtyMenuIds = ref<Set<string>>(new Set());
 
 const disabled = computed(() => !props.role || props.role.status === 1);
 const checkedCount = computed(() => checkedKeys.value.length);
@@ -37,9 +40,24 @@ const treeProps = {
   label: 'name'
 } as const;
 
-function applyCheckedKeys(keys: string[]) {
-  checkedKeys.value = [...keys];
-  treeRef.value?.setCheckedKeys(keys);
+function syncCheckedKeys() {
+  checkedKeys.value = (treeRef.value?.getCheckedKeys(false) as string[]) ?? [];
+}
+
+async function applyCheckedKeys(keys: string[]) {
+  checkedKeys.value = [];
+
+  await nextTick();
+
+  const tree = treeRef.value;
+
+  if (!tree) {
+    return;
+  }
+
+  tree.setCheckedKeys(keys);
+
+  syncCheckedKeys();
 }
 
 function getTagType(type: Api.SystemManage.MenuType): UI.ThemeColor {
@@ -88,7 +106,9 @@ function collectExpandableNodeIds(nodes: Api.SystemManage.MenuSimple[]) {
 
 async function loadRoleMenus() {
   if (!props.role) {
-    applyCheckedKeys([]);
+    baselineMenuIds.value = [];
+    dirtyMenuIds.value = new Set();
+    await applyCheckedKeys([]);
     treeRef.value?.filter(filterKeyword.value);
     return;
   }
@@ -100,19 +120,22 @@ async function loadRoleMenus() {
   permissionLoading.value = false;
 
   if (error) {
-    applyCheckedKeys([]);
+    baselineMenuIds.value = [];
+    dirtyMenuIds.value = new Set();
+    await applyCheckedKeys([]);
     treeRef.value?.filter(filterKeyword.value);
     return;
   }
 
-  // Role-menu bindings are exact IDs from the backend, so tree echo must not
-  // cascade parent checks down to unrelated descendants.
-  applyCheckedKeys(data);
+  baselineMenuIds.value = [...data];
+  dirtyMenuIds.value = new Set();
+  await applyCheckedKeys(data);
   treeRef.value?.filter(filterKeyword.value);
 }
 
-function handleCheck() {
-  checkedKeys.value = (treeRef.value?.getCheckedKeys(false) as string[]) ?? [];
+function handleCheck(data: Api.SystemManage.MenuSimple) {
+  dirtyMenuIds.value = new Set([...dirtyMenuIds.value, data.id]);
+  syncCheckedKeys();
 }
 
 async function handleSave() {
@@ -120,7 +143,15 @@ async function handleSave() {
     return;
   }
 
-  const menuIds = (treeRef.value?.getCheckedKeys(false) as string[]) ?? [];
+  const checkedMenuIds = (treeRef.value?.getCheckedKeys(false) as string[]) ?? [];
+  const halfCheckedMenuIds = (treeRef.value?.getHalfCheckedKeys() as string[]) ?? [];
+  const menuIds = resolveRoleMenuSubmitIds({
+    menuTree: props.menuTree,
+    baselineIds: baselineMenuIds.value,
+    dirtyIds: [...dirtyMenuIds.value],
+    checkedIds: checkedMenuIds,
+    halfCheckedIds: halfCheckedMenuIds
+  });
 
   submitting.value = true;
 
@@ -135,7 +166,9 @@ async function handleSave() {
     return;
   }
 
-  checkedKeys.value = [...menuIds];
+  baselineMenuIds.value = [...menuIds];
+  dirtyMenuIds.value = new Set();
+  syncCheckedKeys();
 
   window.$message?.success($t('common.modifySuccess'));
   emit('saved');
@@ -155,9 +188,9 @@ watch(
 
 watch(
   () => props.menuTree.length,
-  value => {
+  async value => {
     if (value && props.role) {
-      applyCheckedKeys(checkedKeys.value);
+      await applyCheckedKeys(baselineMenuIds.value);
       treeRef.value?.filter(filterKeyword.value);
     }
   }
@@ -207,7 +240,6 @@ watch(
             ref="treeRef"
             node-key="id"
             show-checkbox
-            check-strictly
             :default-expanded-keys="defaultExpandedKeys"
             :data="menuTree"
             :props="treeProps"
diff --git a/src/views/system/role/modules/role-resource-tree.ts b/src/views/system/role/modules/role-resource-tree.ts
new file mode 100644
index 0000000..4985338
--- /dev/null
+++ b/src/views/system/role/modules/role-resource-tree.ts
@@ -0,0 +1,132 @@
+export type RoleResourceTreeNode = {
+  id: string;
+  children?: RoleResourceTreeNode[] | null;
+};
+
+type ResolveRoleMenuSubmitIdsInput = {
+  menuTree: RoleResourceTreeNode[];
+  baselineIds: string[];
+  dirtyIds: string[];
+  checkedIds: string[];
+  halfCheckedIds: string[];
+};
+
+type TreeIndex = {
+  orderedIds: string[];
+  parentById: Map<string, string | null>;
+  subtreeIdsById: Map<string, string[]>;
+};
+
+export function resolveRoleMenuSubmitIds(input: ResolveRoleMenuSubmitIdsInput) {
+  const baselineIds = normalizeIds(input.baselineIds);
+
+  if (!input.dirtyIds.length) {
+    return baselineIds;
+  }
+
+  const treeIndex = buildTreeIndex(input.menuTree);
+  const affectedIds = collectAffectedIds(treeIndex, baselineIds, normalizeIds(input.dirtyIds));
+
+  if (!affectedIds.size) {
+    return baselineIds;
+  }
+
+  const nextIdSet = new Set<string>();
+
+  baselineIds.forEach(id => {
+    if (!affectedIds.has(id)) {
+      nextIdSet.add(id);
+    }
+  });
+
+  normalizeIds([...input.checkedIds, ...input.halfCheckedIds]).forEach(id => {
+    if (affectedIds.has(id)) {
+      nextIdSet.add(id);
+    }
+  });
+
+  return sortIdsByTreeOrder(treeIndex.orderedIds, nextIdSet);
+}
+
+function normalizeIds(ids: string[]) {
+  return [...new Set(ids.map(id => String(id).trim()).filter(Boolean))];
+}
+
+function buildTreeIndex(nodes: RoleResourceTreeNode[]) {
+  const orderedIds: string[] = [];
+  const parentById = new Map<string, string | null>();
+  const subtreeIdsById = new Map<string, string[]>();
+
+  const walk = (items: RoleResourceTreeNode[], parentId: string | null) => {
+    items.forEach(item => {
+      orderedIds.push(item.id);
+      parentById.set(item.id, parentId);
+
+      const childIds = item.children?.length ? walk(item.children, item.id) : [];
+      subtreeIdsById.set(item.id, [item.id, ...childIds]);
+    });
+
+    return items.flatMap(item => subtreeIdsById.get(item.id) ?? [item.id]);
+  };
+
+  walk(nodes, null);
+
+  return {
+    orderedIds,
+    parentById,
+    subtreeIdsById
+  } satisfies TreeIndex;
+}
+
+function collectAffectedIds(treeIndex: TreeIndex, baselineIds: string[], dirtyIds: string[]) {
+  const affectedIds = new Set<string>();
+  const baselineIdSet = new Set(baselineIds);
+
+  dirtyIds.forEach(dirtyId => {
+    const subtreeIds = treeIndex.subtreeIdsById.get(dirtyId) ?? [dirtyId];
+    subtreeIds.forEach(id => affectedIds.add(id));
+
+    const ancestors = collectAncestorIds(treeIndex.parentById, dirtyId);
+
+    ancestors.forEach(ancestorId => {
+      if (!baselineIdSet.has(ancestorId)) {
+        return;
+      }
+
+      const ancestorSubtreeIds = treeIndex.subtreeIdsById.get(ancestorId) ?? [ancestorId];
+      ancestorSubtreeIds.forEach(id => affectedIds.add(id));
+    });
+  });
+
+  return affectedIds;
+}
+
+function collectAncestorIds(parentById: Map<string, string | null>, nodeId: string) {
+  const ancestorIds: string[] = [];
+
+  let currentId: string | null | undefined = nodeId;
+
+  while (currentId) {
+    ancestorIds.push(currentId);
+    currentId = parentById.get(currentId) ?? null;
+  }
+
+  return ancestorIds;
+}
+
+function sortIdsByTreeOrder(orderedIds: string[], idSet: Set<string>) {
+  const sortedIds: string[] = [];
+
+  orderedIds.forEach(id => {
+    if (idSet.has(id)) {
+      sortedIds.push(id);
+      idSet.delete(id);
+    }
+  });
+
+  idSet.forEach(id => {
+    sortedIds.push(id);
+  });
+
+  return sortedIds;
+}
diff --git a/tests/role-resource-tree.test.ts b/tests/role-resource-tree.test.ts
new file mode 100644
index 0000000..159a1d3
--- /dev/null
+++ b/tests/role-resource-tree.test.ts
@@ -0,0 +1,78 @@
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { resolveRoleMenuSubmitIds } from '../src/views/system/role/modules/role-resource-tree';
+
+type MenuNode = {
+  id: string;
+  children?: MenuNode[];
+};
+
+const menuTree: MenuNode[] = [
+  {
+    id: 'personal',
+    children: [
+      {
+        id: 'weekly',
+        children: [{ id: 'weeklyDetail' }]
+      },
+      {
+        id: 'monthly',
+        children: [{ id: 'monthlyDetail' }]
+      }
+    ]
+  },
+  {
+    id: 'infra',
+    children: [{ id: 'stateMachine' }, { id: 'cmd' }]
+  }
+];
+
+describe('resolveRoleMenuSubmitIds', () => {
+  it('keeps original ids when there is no user interaction', () => {
+    const result = resolveRoleMenuSubmitIds({
+      menuTree,
+      baselineIds: ['weekly', 'monthly'],
+      dirtyIds: [],
+      checkedIds: ['personal', 'weekly', 'monthly'],
+      halfCheckedIds: []
+    });
+
+    assert.deepEqual(result, ['weekly', 'monthly']);
+  });
+
+  it('preserves untouched branches when another branch changes', () => {
+    const result = resolveRoleMenuSubmitIds({
+      menuTree,
+      baselineIds: ['weekly', 'monthly'],
+      dirtyIds: ['stateMachine'],
+      checkedIds: ['personal', 'weekly', 'monthly', 'stateMachine'],
+      halfCheckedIds: ['infra']
+    });
+
+    assert.deepEqual(result, ['weekly', 'monthly', 'stateMachine']);
+  });
+
+  it('recomputes the whole dirty branch instead of expanding unrelated baseline ids', () => {
+    const result = resolveRoleMenuSubmitIds({
+      menuTree,
+      baselineIds: ['personal'],
+      dirtyIds: ['weekly'],
+      checkedIds: ['personal', 'weekly', 'weeklyDetail'],
+      halfCheckedIds: []
+    });
+
+    assert.deepEqual(result, ['personal', 'weekly', 'weeklyDetail']);
+  });
+
+  it('does not expand untouched sibling branches under the same ancestor', () => {
+    const result = resolveRoleMenuSubmitIds({
+      menuTree,
+      baselineIds: ['monthly'],
+      dirtyIds: ['weeklyDetail'],
+      checkedIds: ['personal', 'weekly', 'weeklyDetail', 'monthly', 'monthlyDetail'],
+      halfCheckedIds: []
+    });
+
+    assert.deepEqual(result, ['weeklyDetail', 'monthly']);
+  });
+});