diff --git a/src/__tests__/api/reportFragments.spec.ts b/src/__tests__/api/reportFragments.spec.ts
index 5a928c4..77428cb 100644
--- a/src/__tests__/api/reportFragments.spec.ts
+++ b/src/__tests__/api/reportFragments.spec.ts
@@ -22,10 +22,14 @@ describe('reportFragments API', () => {
   it('createFragments sends POST with sessionNum and content', async () => {
     mockedRequest.post.mockResolvedValue({ code: 200, data: { id: 1 } })
     const result = await createFragments('S001', '学习了递归')
-    expect(mockedRequest.post).toHaveBeenCalledWith('/report-fragments', {
-      sessionNum: 'S001',
-      content: '学习了递归',
-    })
+    expect(mockedRequest.post).toHaveBeenCalledWith(
+      '/report-fragments',
+      {
+        sessionNum: 'S001',
+        content: '学习了递归',
+      },
+      { timeout: 300000 },
+    )
     expect(result).toEqual({ code: 200, data: { id: 1 } })
   })
 })
diff --git a/src/__tests__/api/studySessions.spec.ts b/src/__tests__/api/studySessions.spec.ts
index 7a92e8e..9b501e9 100644
--- a/src/__tests__/api/studySessions.spec.ts
+++ b/src/__tests__/api/studySessions.spec.ts
@@ -58,7 +58,8 @@ describe('studySessions API', () => {
     await endSession('S001')
     expect(mockedRequest.post).toHaveBeenCalledWith(
       '/study-sessions/S001/study-sessions/ended',
-      { content: '任务结束' }
+      { content: '任务结束' },
+      { timeout: 300000 }
     )
   })
 
@@ -67,7 +68,8 @@ describe('studySessions API', () => {
     await endSession('S001', '自定义结束')
     expect(mockedRequest.post).toHaveBeenCalledWith(
       '/study-sessions/S001/study-sessions/ended',
-      { content: '自定义结束' }
+      { content: '自定义结束' },
+      { timeout: 300000 }
     )
   })
   it('abortSession sends POST with confirmation phrase', async () => {
diff --git a/src/api/reportFragments.ts b/src/api/reportFragments.ts
index 66f416d..2b54e64 100644
--- a/src/api/reportFragments.ts
+++ b/src/api/reportFragments.ts
@@ -1,14 +1,17 @@
 // src/api/reportFragments.ts
 import request from "@/utils/request";
 
+// 残片生成走 AI 聚合，耗时较长，放宽到 5 分钟（默认全局 30s）
+const AI_TIMEOUT = { timeout: 300_000 };
+
 export const createFragments = (sessionNum: string, content: string) => {
-    return request.post(`/report-fragments`, {sessionNum, content})
+    return request.post(`/report-fragments`, { sessionNum, content }, AI_TIMEOUT)
 }
 
 export const updateFragments = (id: number, content: string) => {
-    return request.put(`/report-fragments/${id}`, {content})
+    return request.put(`/report-fragments/${id}`, { content })
 }
 
 export const getFragmentsBySession = (sessionNum: string) => {
     return request.get(`/report-fragments/session/${sessionNum}`)
-}
\ No newline at end of file
+}
diff --git a/src/api/review.ts b/src/api/review.ts
index a82bca9..b97adb0 100644
--- a/src/api/review.ts
+++ b/src/api/review.ts
@@ -24,15 +24,15 @@ export interface ReviewTaskStats {
 }
 
 export const getReviewFeed = (limit: number = 30, mode: "recent" | "random" | "smart" = "recent") => {
-  return request.get("/review/feed", { limit, mode });
+  return request.get<ReviewFeedItem[]>("/review/feed", { limit, mode });
 };
 
 export const getReviewTaskStats = () => {
-  return request.get("/review/tasks");
+  return request.get<ReviewTaskStats[]>("/review/tasks");
 };
 
 export const getReviewTaskStatsByTask = (taskNum: string) => {
-  return request.get(`/review/tasks/${taskNum}`);
+  return request.get<ReviewTaskStats>(`/review/tasks/${taskNum}`);
 };
 
 export const getReportDetail = (id: number) => {
diff --git a/src/api/standardMindMap.ts b/src/api/standardMindMap.ts
index 4a4263a..6d36632 100644
--- a/src/api/standardMindMap.ts
+++ b/src/api/standardMindMap.ts
@@ -1,4 +1,5 @@
 import request from "@/utils/request";
+import type { ApiResponse } from "@/utils/request";
 
 // ============ 标准思维导图 ============
 
@@ -31,14 +32,17 @@ export interface RecallRecord {
   createdTime: string;
 }
 
-/** 获取/自动生成标准思维导图 */
+// AI 聚合类接口耗时较长，统一放宽到 5 分钟（默认全局 30s）
+const AI_TIMEOUT = { timeout: 300_000 };
+
+/** 获取/自动生成标准思维导图（首次访问会触发 AI 生成） */
 export const getStandardMindMap = (taskNum: string) => {
-  return request.get(`/review/standard-mind-map/${taskNum}`);
+  return request.get<StandardMindMap>(`/review/standard-mind-map/${taskNum}`, {}, AI_TIMEOUT);
 };
 
 /** 强制重新生成标准思维导图（全量或增量） */
 export const regenerateStandardMindMap = (taskNum: string, mode: "full" | "incremental" = "full") => {
-  return request.post(`/review/standard-mind-map/${taskNum}/regenerate?mode=${mode}`);
+  return request.post<StandardMindMap>(`/review/standard-mind-map/${taskNum}/regenerate?mode=${mode}`, null, AI_TIMEOUT);
 };
 
 /** 用户编辑标准思维导图（大纲文本） */
@@ -47,18 +51,22 @@ export const updateStandardMindMap = (taskNum: string, outline: string) => {
 };
 
 /** 用户提交回忆大纲，与标准导图对比（可选指定起始节点路径） */
-export const recallCompare = (taskNum: string, recallOutline: string, focusPath?: string) => {
+export const recallCompare = (
+  taskNum: string,
+  recallOutline: string,
+  focusPath?: string,
+): Promise<ApiResponse<StandardMindMap>> => {
   const body: Record<string, any> = { recallOutline };
   if (focusPath) body.focusPath = focusPath;
-  return request.post(`/review/standard-mind-map/${taskNum}/recall`, body);
+  return request.post(`/review/standard-mind-map/${taskNum}/recall`, body, AI_TIMEOUT);
 };
 
 /** 在标准导图中查找与内容最匹配的节点 */
 export const findNode = (taskNum: string, content: string) => {
-  return request.post(`/review/standard-mind-map/${taskNum}/find-node`, { content });
+  return request.post<{ path: string }>(`/review/standard-mind-map/${taskNum}/find-node`, { content });
 };
 
 /** 获取该任务的所有回忆对比记录 */
 export const listRecallRecords = (taskNum: string) => {
-  return request.get(`/review/standard-mind-map/${taskNum}/recall-records`);
+  return request.get<RecallRecord[]>(`/review/standard-mind-map/${taskNum}/recall-records`);
 };
diff --git a/src/api/studySessions.ts b/src/api/studySessions.ts
index dfddbb6..b88df07 100644
--- a/src/api/studySessions.ts
+++ b/src/api/studySessions.ts
@@ -1,6 +1,40 @@
-// src/api/studySession.ts
+// src/api/studySessions.ts
 import request from "@/utils/request";
 
+/** 学习会话详情（start-or-continue / detail 接口返回的会话核心字段） */
+export interface SessionDetail {
+    sessionNum: string;
+    sessionState: "ONGOING" | "PAUSED" | "ENDED";
+    taskNum: string;
+    taskId: number;
+    taskName?: string;
+    materialUrl?: string;
+    startTime?: string;
+    endTime?: string;
+    lastStartTime?: string;
+    actualTime?: number;
+    effectiveTime?: number;
+    effectivenessRatio?: number | string;
+    pointerPosition?: number;
+    systemMessage?: string;
+}
+
+/** 当前活跃会话摘要（跨页面恢复用） */
+export interface ActiveSessionInfo {
+    taskNum: string;
+    sessionNum: string;
+    taskName?: string;
+}
+
+/** 后端 MyBatis-Plus 分页包装 */
+export interface PagedResult<T> {
+    records: T[];
+    total: number;
+}
+
+// AI 聚合类接口耗时较长，统一放宽到 5 分钟（默认全局 30s）
+const AI_TIMEOUT = { timeout: 300_000 };
+
 export const continueSession = (sessionNum: string) => {
     return request.post(`/study-sessions/${sessionNum}/study-sessions/continue`);
 };
@@ -10,8 +44,9 @@ export const pauseSession = (sessionNum: string, endTime?: Date) => {
     return request.post(`/study-sessions/${sessionNum}/study-sessions/pause`, null, { params });
 };
 
+/** 结束会话会触发后端报告生成，耗时较长 */
 export const endSession = (sessionNum: string, content: string = "任务结束") => {
-    return request.post(`/study-sessions/${sessionNum}/study-sessions/ended`, { content });
+    return request.post(`/study-sessions/${sessionNum}/study-sessions/ended`, { content }, AI_TIMEOUT);
 };
 
 /** 误操作结束学习会话：需输入确认语，严格零数据关闭（删除会话与预期） */
@@ -20,16 +55,16 @@ export const abortSession = (sessionNum: string, confirmation: string) => {
 };
 
 export const startOrContinueStudySession = (taskNum: string) => {
-    return request.get(`/tasks/${taskNum}/study-sessions/start-or-continue`);
+    return request.get<SessionDetail>(`/tasks/${taskNum}/study-sessions/start-or-continue`);
 };
 
 export const getSessionDetail = (sessionNum: string) => {
-    return request.get(`/study-sessions/${sessionNum}`);
+    return request.get<SessionDetail>(`/study-sessions/${sessionNum}`);
 };
 
 /** 获取会话的学习预期 */
 export const getExpectation = (sessionNum: string) => {
-    return request.get(`/study-sessions/${sessionNum}/expectation`);
+    return request.get<{ description: string } | null>(`/study-sessions/${sessionNum}/expectation`);
 };
 
 /** 创建/更新会话的学习预期 */
@@ -37,28 +72,28 @@ export const upsertExpectation = (sessionNum: string, description: string) => {
     return request.put(`/study-sessions/${sessionNum}/expectation`, { description });
 };
 
-/** 获取报告草稿（AI 聚合残片，不可用时为拼接） */
+/** 获取报告草稿（AI 聚合残片，不可用时为拼接），生成失败不阻塞手写总结 */
 export const getReportDraft = (sessionNum: string) => {
-    return request.get(`/study-sessions/${sessionNum}/report-draft`);
+    return request.get<string>(`/study-sessions/${sessionNum}/report-draft`, {}, AI_TIMEOUT);
 };
 
 /** 查询当前是否有活跃会话 */
 export const getActiveSession = (excludeTaskNum?: string) => {
     const params: Record<string, any> = {};
     if (excludeTaskNum) params.excludeTaskNum = excludeTaskNum;
-    return request.get('/study-sessions/active', params);
+    return request.get<ActiveSessionInfo | null>('/study-sessions/active', params);
 };
 
 /** 分页查询任务的历史残片 */
-export const getTaskFragments = (taskNum: string, page: number, size: number, keyword?: string) => {
+export const getTaskFragments = <T = any>(taskNum: string, page: number, size: number, keyword?: string) => {
     const params: Record<string, any> = { page, size };
     if (keyword) params.keyword = keyword;
-    return request.get(`/study-sessions/tasks/${taskNum}/fragments`, params);
+    return request.get<PagedResult<T>>(`/study-sessions/tasks/${taskNum}/fragments`, params);
 };
 
 /** 分页查询任务的历史报告 */
-export const getTaskReports = (taskNum: string, page: number, size: number, keyword?: string) => {
+export const getTaskReports = <T = any>(taskNum: string, page: number, size: number, keyword?: string) => {
     const params: Record<string, any> = { page, size };
     if (keyword) params.keyword = keyword;
-    return request.get(`/study-sessions/tasks/${taskNum}/reports`, params);
+    return request.get<PagedResult<T>>(`/study-sessions/tasks/${taskNum}/reports`, params);
 };
diff --git a/src/api/tasks.ts b/src/api/tasks.ts
index f5dd0b1..d513dd1 100644
--- a/src/api/tasks.ts
+++ b/src/api/tasks.ts
@@ -12,7 +12,7 @@ export interface TaskApplication {
 }
 
 export const getTaskApplications = (taskNum: string) => {
-  return request.get(`/tasks/${taskNum}/applications`);
+  return request.get<TaskApplication[]>(`/tasks/${taskNum}/applications`);
 };
 
 export const createTaskApplication = (
@@ -24,7 +24,7 @@ export const createTaskApplication = (
     status?: TaskApplication["status"];
   },
 ) => {
-  return request.post(`/tasks/${taskNum}/applications`, payload);
+  return request.post<TaskApplication>(`/tasks/${taskNum}/applications`, payload);
 };
 
 export const updateTaskApplication = (
@@ -36,7 +36,7 @@ export const updateTaskApplication = (
     status?: TaskApplication["status"];
   },
 ) => {
-  return request.put(`/tasks/applications/${id}`, payload);
+  return request.put<TaskApplication>(`/tasks/applications/${id}`, payload);
 };
 
 export const deleteTaskApplication = (id: number) => {
@@ -54,10 +54,10 @@ export interface PriorityWeights {
 }
 
 export const getPriorityWeights = () => {
-  return request.get("/tasks/priority-weights");
+  return request.get<PriorityWeights>("/tasks/priority-weights");
 };
 
 /** 保存权重配置并触发全部任务优先级重算 */
 export const savePriorityWeights = (weights: PriorityWeights) => {
-  return request.put("/tasks/priority-weights", weights);
+  return request.put<PriorityWeights>("/tasks/priority-weights", weights);
 };
diff --git a/src/utils/request.ts b/src/utils/request.ts
index 1c94872..3ba7d8e 100644
--- a/src/utils/request.ts
+++ b/src/utils/request.ts
@@ -2,11 +2,21 @@ import axios from 'axios';
 import { ElMessage } from "element-plus";
 import router from "@/router";
 
-const basic_url = import.meta.env.VITE_BASE_URL;
+/** 后端统一响应包装：code === 200 表示业务成功 */
+export interface ApiResponse<T = any> {
+    code: number;
+    message?: string;
+    data: T;
+}
+
+const baseURL = import.meta.env.VITE_BASE_URL;
+
+// 默认 30s：普通 CRUD 足够；AI 聚合等长耗时接口需在 api 层显式覆写 timeout
+const DEFAULT_TIMEOUT = 30_000;
 
 const axiosInstance = axios.create({
-    baseURL: basic_url,
-    timeout: 600000,
+    baseURL,
+    timeout: DEFAULT_TIMEOUT,
     withCredentials: true
 });
 
@@ -51,43 +61,43 @@ const validateResponse = (res: any) => {
     return result;
 };
 
-function get(url: string, params: Record<string, any>): Promise<any>;
-function get(url: string): Promise<any>;
-
-function get(url: string, params: Record<string, any> = {}) {
-    return axiosInstance.get(url, { params })
+const get = <T = any>(
+    url: string,
+    params: Record<string, any> = {},
+    config: Record<string, any> = {},
+): Promise<ApiResponse<T>> =>
+    axiosInstance.get(url, { params, ...config })
         .then(validateResponse)
         .catch(handleError);
-}
 
-const post = (url: string, data: any = null, config: any = {}) => {
-
-    if (config.params) {
-        // 如果传入 config.params，则作为 URL 参数
-        return axiosInstance.post(url, data, { params: config.params, ...config })
-            .then(validateResponse)
-            .catch(handleError);
-    } else {
-        // 默认 POST JSON
-        return axiosInstance.post(url, data, config)
-            .then(validateResponse)
-            .catch(handleError);
-    }
-};
-
-const put = (url: string, data: any, config: any = {}) => {
-    return axiosInstance.put(url, data, config)
+const post = <T = any>(
+    url: string,
+    data: any = null,
+    config: Record<string, any> = {},
+): Promise<ApiResponse<T>> =>
+    axiosInstance.post(url, data, config)
         .then(validateResponse)
         .catch(handleError);
-};
 
-const del = (url: string, params: Record<string, any> = {}, config: any = {}) => {
-    return axiosInstance.delete(url, { params, ...config })
+const put = <T = any>(
+    url: string,
+    data: any,
+    config: Record<string, any> = {},
+): Promise<ApiResponse<T>> =>
+    axiosInstance.put(url, data, config)
         .then(validateResponse)
         .catch(handleError);
-};
 
-const requestNotImplemented = (method: string) => {
+const del = <T = any>(
+    url: string,
+    params: Record<string, any> = {},
+    config: Record<string, any> = {},
+): Promise<ApiResponse<T>> =>
+    axiosInstance.delete(url, { params, ...config })
+        .then(validateResponse)
+        .catch(handleError);
+
+const requestNotImplemented = () => {
     ElMessage.error("该功能暂不可用，请刷新后重试");
     throw new Error("该功能暂不可用，请刷新后重试");
 };
@@ -98,7 +108,7 @@ const request = (method: string, url: string, paramsOrData: any) => {
         case 'post': return post(url, paramsOrData);
         case 'put': return put(url, paramsOrData);
         case 'delete': return del(url, paramsOrData);
-        default: return requestNotImplemented(method);
+        default: return requestNotImplemented();
     }
 };