diff --git a/furniture-3d-system/src/lib/intake-node-permission-settings.test.ts b/furniture-3d-system/src/lib/intake-node-permission-settings.test.ts
index 4e320046..2606b7bf 100644
--- a/furniture-3d-system/src/lib/intake-node-permission-settings.test.ts
+++ b/furniture-3d-system/src/lib/intake-node-permission-settings.test.ts
@@ -68,7 +68,7 @@ describe('intake node permission settings', () => {
           '江苏简尚品牌管理有限公司 > 供应链中心 > 品牌 采购部 > 跟单组',
         ],
       }),
-    ).toEqual(['merchandiser'])
+    ).toEqual(['merchandiser', 'purchase'])
 
     expect(
       resolveIntakeNodePermissionSubjectKeys({
@@ -99,7 +99,7 @@ describe('intake node permission settings', () => {
           '江苏简尚品牌管理有限公司 > 供应链中心 > 跟单质检部',
         ],
       }),
-    ).toEqual(['merchandiser'])
+    ).toEqual(['merchandiser', 'purchase'])
 
     expect(
       resolveIntakeNodePermissionSubjectKeys({
@@ -110,7 +110,7 @@ describe('intake node permission settings', () => {
           '江苏简尚品牌管理有限公司 > 供应链中心 > 跟单质检部',
         ],
       }),
-    ).toEqual(['merchandiser'])
+    ).toEqual(['merchandiser', 'purchase'])
 
     expect(
       resolveIntakeNodePermissionSubjectKeys({
@@ -188,6 +188,37 @@ describe('intake node permission settings', () => {
     ).toEqual(['management'])
   })
 
+  it('lets merchandiser users inherit permissions opened for purchasing', () => {
+    const subjectKeys = resolveIntakeNodePermissionSubjectKeys({
+      name: '雁兰',
+      role: 'USER',
+      businessRoles: ['PURCHASING'],
+      departmentPaths: [
+        '江苏简尚品牌管理有限公司 > 供应链中心 > 跟单质检部',
+      ],
+    })
+
+    expect(subjectKeys).toEqual(['merchandiser', 'purchase'])
+
+    expect(
+      resolveIntakeNodePermissionAccess({}, 'bomCostingWorkbench', subjectKeys),
+    ).toMatchObject({
+      defaultState: 'readonly',
+      view: true,
+      edit: false,
+    })
+
+    const overrides = sanitizeIntakeNodePermissionOverrides({
+      [buildIntakeNodePermissionOverrideKey('warehouseManage', 'purchase', 'view')]: true,
+    })
+    expect(
+      resolveIntakeNodePermissionAccess(overrides, 'warehouseManage', subjectKeys),
+    ).toMatchObject({ view: true, download: false, edit: false })
+    expect(
+      resolveIntakeNodePermissionAccess({}, 'warehouseManage', subjectKeys),
+    ).toMatchObject({ view: false, edit: false })
+  })
+
   it('uses the same matrix for default view, download, and admin-opened overrides', () => {
     const spaceKeys = ['space'] as const
     expect(
diff --git a/furniture-3d-system/src/lib/intake-node-permission-settings.ts b/furniture-3d-system/src/lib/intake-node-permission-settings.ts
index d519c3f3..cc9c00a4 100644
--- a/furniture-3d-system/src/lib/intake-node-permission-settings.ts
+++ b/furniture-3d-system/src/lib/intake-node-permission-settings.ts
@@ -1055,6 +1055,8 @@ export function resolveIntakeNodePermissionSubjectKeys(
     hasDepartmentPath(user, isMerchandiserDepartmentPath)
   ) {
     pushUniqueSubject(keys, "merchandiser");
+    // 采购-跟单必须继承采购负责人主体：给采购开的权限对跟单自动生效，不允许两套分开开
+    pushUniqueSubject(keys, "purchase");
   }
 
   if (