diff --git a/packages/form/src/fields/Select.vue b/packages/form/src/fields/Select.vue
index 26cc8ddf..218dc94f 100644
--- a/packages/form/src/fields/Select.vue
+++ b/packages/form/src/fields/Select.vue
@@ -78,7 +78,7 @@
 </template>
 
 <script lang="ts" setup>
-import { inject, nextTick, onBeforeMount, ref, watch, watchEffect } from 'vue';
+import { inject, nextTick, ref, watch, watchEffect } from 'vue';
 
 import { getDesignConfig, TMagicSelect } from '@tmagic/design';
 import { getValueByKeyPath } from '@tmagic/utils';
@@ -123,6 +123,26 @@ const equalValue = (value: any, v: any): boolean => {
   return value === v;
 };
 
+const hasOption = (value: any): boolean => {
+  const { config } = props;
+
+  if (Array.isArray(value) && !value.length) return true;
+
+  if (config.group) {
+    const groups = options.value as SelectGroupOption[];
+    if (config.multiple && Array.isArray(value)) {
+      return value.every((v) => groups.some((group) => group.options.some((item) => equalValue(item.value, v))));
+    }
+    return groups.some((group) => group.options.some((item) => equalValue(item.value, value)));
+  }
+
+  const opts = options.value as SelectOption[];
+  if (config.multiple && Array.isArray(value)) {
+    return value.every((v) => opts.some((item) => equalValue(item.value, v)));
+  }
+  return opts.some((item) => equalValue(item.value, value));
+};
+
 const mapOptions = (data: any[]) => {
   const {
     option = {
@@ -392,15 +412,22 @@ if (typeof props.config.options === 'function') {
     setOptions(props.config.options as SelectOption[] | SelectGroupOption[]);
   });
 } else if (props.config.option) {
-  onBeforeMount(() => {
+  const initOption = async () => {
     if (!props.model) return;
     const v = props.model[props.name];
-    if (Array.isArray(v) ? v.length : typeof v !== 'undefined') {
-      getInitOption().then((data) => {
-        setOptions(data);
-      });
-    }
-  });
+    if (Array.isArray(v) ? !v.length : typeof v === 'undefined') return;
+    if (typeof v === 'undefined' || hasOption(v)) return;
+    const data = await getInitOption();
+    setOptions(data);
+  };
+
+  watch(
+    () => props.model?.[props.name],
+    () => {
+      void initOption();
+    },
+    { immediate: true },
+  );
 }
 
 if (props.config.remote) {
diff --git a/packages/form/tests/unit/fields/Select.spec.ts b/packages/form/tests/unit/fields/Select.spec.ts
index c36abefa..b5a5748b 100644
--- a/packages/form/tests/unit/fields/Select.spec.ts
+++ b/packages/form/tests/unit/fields/Select.spec.ts
@@ -203,3 +203,132 @@ describe('Select - getInitOption empty value', () => {
     expect(wrapper.findComponent(MSelect).exists()).toBe(true);
   });
 });
+
+describe('Select - config.option model value watch', () => {
+  let request: ReturnType<typeof vi.fn>;
+
+  const mountFormWithRequest = (config: any[], initValues: any = {}) =>
+    mount(MForm, {
+      global: { plugins: [ElementPlus as any, [MagicForm as any, { request }]] },
+      props: { config, initValues },
+    });
+
+  const flushAsync = async () => {
+    await nextTick();
+    await new Promise((r) => setTimeout(r, 0));
+    await nextTick();
+  };
+
+  const buildConfig = (extra: any = {}) => [
+    {
+      name: 's',
+      type: 'select',
+      text: 's',
+      option: {
+        url: 'https://example.com/list',
+        initUrl: 'https://example.com/init',
+        initRoot: 'data.list',
+        ...extra,
+      },
+    },
+  ];
+
+  beforeEach(() => {
+    request = vi.fn((postOptions: Record<string, any>) => {
+      const id = postOptions.data?.id;
+      const ids = Array.isArray(id) ? id : [id];
+      return Promise.resolve({
+        data: {
+          list: ids.map((value: string) => ({ text: `Label-${value}`, value })),
+        },
+      });
+    });
+    setConfig({ request });
+  });
+
+  afterEach(() => {
+    setConfig({});
+    vi.restoreAllMocks();
+  });
+
+  test('model 值变化且 options 中无对应项时重新 getInitOption', async () => {
+    const wrapper = mountFormWithRequest(buildConfig(), { s: 'x' });
+    await flushAsync();
+
+    expect(request).toHaveBeenCalledTimes(1);
+    expect(request.mock.calls[0][0].data).toMatchObject({ id: 'x' });
+
+    const select = wrapper.findComponent(MSelect);
+    expect((select.vm as any).options[0]).toMatchObject({ text: 'Label-x', value: 'x' });
+
+    (wrapper.vm as any).values.s = 'y';
+    await flushAsync();
+
+    expect(request).toHaveBeenCalledTimes(2);
+    expect(request.mock.calls[1][0].url).toBe('https://example.com/init');
+    expect(request.mock.calls[1][0].data).toMatchObject({ id: 'y' });
+    expect((select.vm as any).options[0]).toMatchObject({ text: 'Label-y', value: 'y' });
+  });
+
+  test('model 值变化但 options 已包含对应项时不重复请求', async () => {
+    const wrapper = mountFormWithRequest(buildConfig(), { s: 'x' });
+    await flushAsync();
+
+    (wrapper.vm as any).values.s = 'y';
+    await flushAsync();
+    expect(request).toHaveBeenCalledTimes(2);
+
+    request.mockClear();
+    (wrapper.vm as any).values.s = 'y';
+    await flushAsync();
+
+    expect(request).not.toHaveBeenCalled();
+  });
+
+  test('model 值变为 undefined 时不发起 init 请求', async () => {
+    const wrapper = mountFormWithRequest(buildConfig(), { s: 'x' });
+    await flushAsync();
+    const callCount = request.mock.calls.length;
+
+    (wrapper.vm as any).values.s = undefined;
+    await flushAsync();
+
+    expect(request.mock.calls.length).toBe(callCount);
+  });
+
+  test('multiple：model 值变化且缺少选项时重新 getInitOption', async () => {
+    const wrapper = mountFormWithRequest(
+      [
+        {
+          name: 's',
+          type: 'select',
+          text: 's',
+          multiple: true,
+          option: {
+            url: 'https://example.com/list',
+            initUrl: 'https://example.com/init',
+            initRoot: 'data.list',
+          },
+        },
+      ],
+      { s: ['x'] },
+    );
+    await flushAsync();
+
+    const select = wrapper.findComponent(MSelect);
+    expect((select.vm as any).options).toEqual(
+      expect.arrayContaining([expect.objectContaining({ text: 'Label-x', value: 'x' })]),
+    );
+
+    (wrapper.vm as any).values.s = ['x', 'y'];
+    await flushAsync();
+
+    expect(request.mock.calls.at(-1)?.[0].data).toMatchObject({ id: ['x', 'y'] });
+    expect((select.vm as any).options).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ text: 'Label-x', value: 'x' }),
+        expect.objectContaining({ text: 'Label-y', value: 'y' }),
+      ]),
+    );
+  });
+});