diff --git a/PROJECT_AUDIT_2026-03-03.md b/PROJECT_AUDIT_2026-03-03.md
index 3ed65a0..025045c 100644
--- a/PROJECT_AUDIT_2026-03-03.md
+++ b/PROJECT_AUDIT_2026-03-03.md
@@ -55,7 +55,11 @@
   - 对 `undo/reset` 等相关接口同步增加 ID 合法性校验；
   - 增加“非法 restaurantId”单测。
 
-### P1-1 `suggest-item` 接口缺失鉴权（可被匿名滥用，产生外部 API 成本）
+### P1-1 `suggest-item` 接口缺失鉴权（可被匿名滥用，产生外部 API 成本）【已完成】
+- 修复状态：✅ 已完成（2026-03-03）
+- 修复内容：
+  - `POST /api/blindbox/plan/suggest-item` 增加登录鉴权（无登录态返回 401）；
+  - 新增接口测试，覆盖“未登录拒绝访问”与“登录成功返回推荐”。
 - 证据：
   - `src/app/api/blindbox/plan/suggest-item/route.ts:6-11`（无 `getAuthUserId` / 无 membership 校验）
 - 影响：
diff --git a/src/app/api/blindbox/plan/suggest-item/route.test.ts b/src/app/api/blindbox/plan/suggest-item/route.test.ts
new file mode 100644
index 0000000..bb556da
--- /dev/null
+++ b/src/app/api/blindbox/plan/suggest-item/route.test.ts
@@ -0,0 +1,82 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { createRequest, parseJsonResponse } from "@/__tests__/helpers/api-test-utils";
+import { ApiError } from "@/lib/api";
+
+vi.mock("@/lib/ai", () => ({
+  suggestAlternativeItems: vi.fn(),
+}));
+
+vi.mock("@/lib/amap", () => ({
+  searchPois: vi.fn(),
+}));
+
+vi.mock("@/lib/auth", () => ({
+  getAuthUserId: vi.fn(),
+}));
+
+import { POST } from "./route";
+import { suggestAlternativeItems } from "@/lib/ai";
+import { searchPois } from "@/lib/amap";
+import { getAuthUserId } from "@/lib/auth";
+
+const mockSuggestAlternativeItems = vi.mocked(suggestAlternativeItems);
+const mockSearchPois = vi.mocked(searchPois);
+const mockGetAuthUserId = vi.mocked(getAuthUserId);
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("POST /api/blindbox/plan/suggest-item", () => {
+  it("returns 401 when not authenticated", async () => {
+    mockGetAuthUserId.mockRejectedValue(new ApiError("请先登录", 401));
+
+    const req = createRequest("/api/blindbox/plan/suggest-item", {
+      method: "POST",
+      body: { activity: "看展" },
+    });
+    const res = await POST(req);
+    expect(res.status).toBe(401);
+  });
+
+  it("returns mapped suggestions for authenticated user", async () => {
+    mockGetAuthUserId.mockResolvedValue("user-1");
+    mockSuggestAlternativeItems.mockResolvedValue([
+      {
+        activity: "看展",
+        searchQuery: "上海博物馆",
+        reason: "交通方便",
+      },
+    ]);
+    mockSearchPois.mockResolvedValue([
+      {
+        name: "上海博物馆",
+        address: "黄浦区人民大道201号",
+        lat: 31.2301,
+        lng: 121.4737,
+      },
+    ]);
+
+    const req = createRequest("/api/blindbox/plan/suggest-item", {
+      method: "POST",
+      body: {
+        activity: "文艺活动",
+        time: "14:00",
+        location: "121.47,31.23",
+      },
+    });
+    const res = await POST(req);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(200);
+    expect(data.suggestions).toHaveLength(1);
+    expect(data.suggestions[0]).toMatchObject({
+      activity: "看展",
+      poi: "上海博物馆",
+      address: "黄浦区人民大道201号",
+      lat: 31.2301,
+      lng: 121.4737,
+      reason: "交通方便",
+    });
+  });
+});
diff --git a/src/app/api/blindbox/plan/suggest-item/route.ts b/src/app/api/blindbox/plan/suggest-item/route.ts
index 181c069..5950c1f 100644
--- a/src/app/api/blindbox/plan/suggest-item/route.ts
+++ b/src/app/api/blindbox/plan/suggest-item/route.ts
@@ -2,8 +2,10 @@ import { NextResponse } from "next/server";
 import { apiHandler, ApiError } from "@/lib/api";
 import { suggestAlternativeItems } from "@/lib/ai";
 import { searchPois } from "@/lib/amap";
+import { getAuthUserId } from "@/lib/auth";
 
 export const POST = apiHandler(async (req) => {
+  await getAuthUserId(req);
   const { activity, time, location } = await req.json();
   if (!activity) throw new ApiError("activity 不能为空", 400);