diff --git a/docs/src/components/common-ui/vben-form.md b/docs/src/components/common-ui/vben-form.md
index 582e1fb14..29f616d49 100644
--- a/docs/src/components/common-ui/vben-form.md
+++ b/docs/src/components/common-ui/vben-form.md
@@ -636,10 +636,10 @@ export interface FormCommonConfig {
 
 :::
 
-::: details FormSchema
+::: details FormFieldSchema
 
 ```ts
-export interface FormSchema<
+export interface FormFieldSchema<
   T extends BaseFormComponentType = BaseFormComponentType,
   TValues extends FormValues = FormValues,
 > extends FormCommonConfig {
@@ -682,7 +682,7 @@ export interface FormSchema<
 
 ::: details FormGroupSchema
 
-`schema` 数组中的每一项要么是字段（`FormFieldSchema`，即上面的 `FormSchema`），要么是分组（`FormGroupSchema`），以 `type: 'group'` 区分。
+`schema` 数组中的每一项要么是字段（`FormFieldSchema`），要么是分组（`FormGroupSchema`），以 `type: 'group'` 区分。
 
 ```ts
 export interface FormGroupSchema<
@@ -710,6 +710,11 @@ export interface FormGroupSchema<
   /** 分组内部的栅格布局，缺省继承表单的 wrapperClass */
   wrapperClass?: WrapperClassType;
 }
+
+export type FormSchema<
+  T extends BaseFormComponentType = BaseFormComponentType,
+  TValues extends FormValues = FormValues,
+> = FormFieldSchema<T, TValues> | FormGroupSchema<T, TValues>;
 ```
 
 :::
diff --git a/packages/@core/ui-kit/form-ui/__tests__/form-group.test.ts b/packages/@core/ui-kit/form-ui/__tests__/form-group.test.ts
index 5dbed7304..95ad1b4d7 100644
--- a/packages/@core/ui-kit/form-ui/__tests__/form-group.test.ts
+++ b/packages/@core/ui-kit/form-ui/__tests__/form-group.test.ts
@@ -76,6 +76,7 @@ describe('form group rendering', () => {
 
     expect(wrapper.get('.form-group-title').text()).toBe('Contact');
     expect(wrapper.text()).toContain('Optional');
+    expect(wrapper.get('.form-group-trigger').text()).not.toContain('Optional');
     expect(wrapper.findAll('input')).toHaveLength(3);
     expect(wrapper.get('.form-group').findAll('input')).toHaveLength(2);
     expect(getGroupState(wrapper)).toBe('open');
@@ -91,22 +92,34 @@ describe('form group rendering', () => {
     await flushPromises();
 
     expect(getGroupState(wrapper)).toBe('closed');
-
-    await wrapper.get('.form-group-header').trigger('click');
+    expect(wrapper.get('button.form-group-trigger').attributes('type')).toBe(
+      'button',
+    );
+    expect(
+      wrapper.get('button.form-group-trigger').attributes('aria-expanded'),
+    ).toBe('false');
+
+    await wrapper.get('button.form-group-trigger').trigger('click');
     expect(getGroupState(wrapper)).toBe('open');
+    expect(
+      wrapper.get('button.form-group-trigger').attributes('aria-expanded'),
+    ).toBe('true');
 
-    await wrapper.get('.form-group-header').trigger('click');
+    await wrapper.get('button.form-group-trigger').trigger('click');
     expect(getGroupState(wrapper)).toBe('closed');
   });
 
-  it('keeps a non-collapsible group open when the header is clicked', async () => {
+  it('keeps a non-collapsible group open despite defaultCollapsed', async () => {
     const [Form] = useVbenForm({
-      schema: [createContactGroup({ collapsible: false })],
+      schema: [
+        createContactGroup({ collapsible: false, defaultCollapsed: true }),
+      ],
     });
     const wrapper = mount(Form);
     wrappers.push(wrapper);
     await flushPromises();
 
+    expect(wrapper.find('button.form-group-trigger').exists()).toBe(false);
     await wrapper.get('.form-group-header').trigger('click');
     expect(getGroupState(wrapper)).toBe('open');
   });
@@ -143,6 +156,43 @@ describe('form group rendering', () => {
     expect(wrapper.text()).toContain('Email is required');
   });
 
+  it('expands for validation errors in array descendants', async () => {
+    const [Form, formApi] = useVbenForm({
+      schema: [
+        createContactGroup({
+          children: [
+            {
+              children: [
+                {
+                  component: TestInput,
+                  fieldName: 'phone',
+                  label: 'Phone',
+                  rules: z.string().min(1, 'Phone is required'),
+                },
+              ],
+              defaultValue: [{ phone: '' }],
+              fieldName: 'contacts',
+              type: 'array',
+            },
+          ],
+          defaultCollapsed: true,
+        }),
+      ],
+    });
+    const wrapper = mount(Form);
+    wrappers.push(wrapper);
+    await flushPromises();
+
+    expect(getGroupState(wrapper)).toBe('closed');
+    expect(await formApi.validate()).toEqual({
+      errors: { 'contacts[0].phone': 'Phone is required' },
+      valid: false,
+    });
+    await flushPromises();
+
+    expect(getGroupState(wrapper)).toBe('open');
+  });
+
   it('skips hidden groups and forwards field slots into groups', async () => {
     const [Form] = useVbenForm({
       schema: [
diff --git a/packages/@core/ui-kit/form-ui/src/form-render/form-group.vue b/packages/@core/ui-kit/form-ui/src/form-render/form-group.vue
index 56d0f748f..a50222e77 100644
--- a/packages/@core/ui-kit/form-ui/src/form-render/form-group.vue
+++ b/packages/@core/ui-kit/form-ui/src/form-render/form-group.vue
@@ -24,7 +24,9 @@ const props = withDefaults(defineProps<Props>(), {
 
 const formRenderProps = injectRenderFormProps();
 
-const collapseOpen = ref(!props.schema.defaultCollapsed);
+const collapseOpen = ref(
+  props.schema.collapsible === false || !props.schema.defaultCollapsed,
+);
 
 const shouldCollapsible = computed(() => {
   return props.schema.collapsible !== false;
@@ -33,8 +35,14 @@ const shouldCollapsible = computed(() => {
 // 组内任一字段校验失败时自动展开，避免错误提示被折叠区域遮住
 const hasInvalidField = computed(() => {
   const errors = formRenderProps.form?.errors ?? {};
-  return props.schema.children.some((field) =>
-    Boolean(errors[field.fieldName]),
+  return props.schema.children.some(({ fieldName }) =>
+    Object.entries(errors).some(
+      ([errorFieldName, error]) =>
+        Boolean(error) &&
+        (errorFieldName === fieldName ||
+          errorFieldName.startsWith(`${fieldName}.`) ||
+          errorFieldName.startsWith(`${fieldName}[`)),
+    ),
   );
 });
 
@@ -65,36 +73,47 @@ function toggleCollapsed() {
     <VbenCollapsible v-model:open="collapseOpen" :show-trigger="false">
       <template #label>
         <div
-          :class="
-            cn(
-              'form-group-header mb-2 flex min-h-7 flex-1 items-center gap-2',
-              {
-                'cursor-pointer select-none': shouldCollapsible,
-              },
-            )
-          "
-          @click="toggleCollapsed"
+          class="form-group-header mb-2 flex min-h-7 flex-1 items-center gap-2"
         >
-          <span class="bg-primary h-3.5 w-[3px] flex-none rounded-full"></span>
-          <span
-            v-if="props.schema.title"
-            class="form-group-title text-sm font-medium leading-6"
-          >
-            <VbenRenderContent :content="props.schema.title" />
-          </span>
-          <div v-if="props.schema.extra" class="ml-auto" @click.stop>
-            <VbenRenderContent :content="props.schema.extra" />
-          </div>
-          <ChevronsDown
-            v-if="shouldCollapsible"
-            :size="16"
+          <component
+            :is="shouldCollapsible ? 'button' : 'div'"
+            :aria-expanded="shouldCollapsible ? collapseOpen : undefined"
             :class="
-              cn('text-muted-foreground transition-transform', {
-                'ml-auto': !props.schema.extra,
-                'rotate-180': collapseOpen,
+              cn('flex min-w-0 flex-1 items-center gap-2 text-left', {
+                'focus-visible:ring-ring cursor-pointer select-none rounded-sm outline-none focus-visible:ring-2':
+                  shouldCollapsible,
               })
             "
-          />
+            :type="shouldCollapsible ? 'button' : undefined"
+            class="form-group-trigger"
+            @click="toggleCollapsed"
+          >
+            <span
+              class="bg-primary h-3.5 w-[3px] flex-none rounded-full"
+            ></span>
+            <span
+              v-if="props.schema.title"
+              class="form-group-title text-sm font-medium leading-6"
+            >
+              <VbenRenderContent :content="props.schema.title" />
+            </span>
+            <ChevronsDown
+              v-if="shouldCollapsible"
+              aria-hidden="true"
+              :size="16"
+              :class="
+                cn(
+                  'text-muted-foreground ml-auto flex-none transition-transform',
+                  {
+                    'rotate-180': collapseOpen,
+                  },
+                )
+              "
+            />
+          </component>
+          <div v-if="props.schema.extra" class="flex-none">
+            <VbenRenderContent :content="props.schema.extra" />
+          </div>
         </div>
       </template>
       <template #collapsibleContent>