diff --git a/frontend/tests/unit/LoginPage.submitting.test.tsx b/frontend/tests/unit/LoginPage.submitting.test.tsx
new file mode 100644
index 0000000..0a1943c
--- /dev/null
+++ b/frontend/tests/unit/LoginPage.submitting.test.tsx
@@ -0,0 +1,62 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { screen, waitFor } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+
+vi.mock('../../src/api/usrApi', () => ({
+  fetchCompanies: vi.fn(),
+  login: vi.fn(),
+}));
+
+import { fetchCompanies, login } from '../../src/api/usrApi';
+import LoginPage from '../../src/pages/usr/Login/LoginPage';
+import { renderWithProviders } from './renderLogin';
+
+const mockedFetch = fetchCompanies as unknown as ReturnType<typeof vi.fn>;
+const mockedLogin = login as unknown as ReturnType<typeof vi.fn>;
+
+// 单项版本已自动选中（spec § 6.3），只需填用户名 / 密码即构成可提交表单
+async function fillForm(user: ReturnType<typeof userEvent.setup>) {
+  await user.type(screen.getByPlaceholderText('请输入你的用户名'), 'admin');
+  await user.type(screen.getByPlaceholderText('请输入你的密码'), 'secret');
+}
+
+describe('LoginPage 提交中态', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    localStorage.clear();
+    mockedFetch.mockResolvedValue([{ id: 1, sCompanyName: '甲公司', sVersion: '标准版' }]);
+  });
+
+  it('button loading and fields disabled while submitting', async () => {
+    mockedLogin.mockReturnValue(new Promise(() => {})); // pending
+    renderWithProviders(<LoginPage />);
+    expect(await screen.findByText('甲公司（标准版）')).toBeInTheDocument();
+    const user = userEvent.setup();
+    await user.type(screen.getByPlaceholderText('请输入你的用户名'), 'admin');
+    await user.type(screen.getByPlaceholderText('请输入你的密码'), 'secret');
+    const submit = screen.getByRole('button', { name: /登\s*录/ });
+    await user.click(submit);
+    // 按钮 loading
+    await waitFor(() => expect(submit).toHaveClass('ant-btn-loading'));
+    // 字段禁用
+    expect(screen.getByPlaceholderText('请输入你的用户名')).toBeDisabled();
+    expect(screen.getByPlaceholderText('请输入你的密码')).toBeDisabled();
+  });
+
+  it('ignores duplicate submit while pending', async () => {
+    mockedLogin.mockReturnValue(new Promise(() => {})); // pending
+    renderWithProviders(<LoginPage />);
+    expect(await screen.findByText('甲公司（标准版）')).toBeInTheDocument();
+    const user = userEvent.setup();
+    await fillForm(user);
+    const submit = screen.getByRole('button', { name: /登\s*录/ });
+    await user.click(submit);
+    await waitFor(() => expect(mockedLogin).toHaveBeenCalledTimes(1));
+    // pending 期间再次点击 + 回车
+    await user.click(submit);
+    await user.keyboard('{Enter}');
+    // 仍只调用一次
+    await new Promise((r) => setTimeout(r, 50));
+    expect(mockedLogin).toHaveBeenCalledTimes(1);
+  });
+});