diff --git a/project_codebase.md b/project_codebase.md
index c7298dd..c7049d8 100644
--- a/project_codebase.md
+++ b/project_codebase.md
@@ -8,6 +8,11 @@
 - **Implementation**: Programmatically mounts `WMessage.vue`.
 - **New Feature**: Supports `position` argument: `'top-center' | 'top-left' | 'top-right' | 'bottom-center' | 'bottom-left' | 'bottom-right'`.
 
+### `src/utils/loading.ts`
+- **Purpose**: Provides a global interface for showing a full-screen blocking loading overlay.
+- **Methods**: `show()`, `hide()`.
+- **Implementation**: Programmatically mounts `WLoading.vue` with a reference counter to handle concurrent requests.
+
 ### `src/service/request/index.ts`
 - **Purpose**: Encapsulates Axios for API requests.
 - **Features**:
@@ -15,7 +20,9 @@
     - Adds `Authorization: Bearer <token>`.
     - Adds `X-App-Sign` and `X-App-Timestamp` headers.
     - Starts `NProgress`.
+    - **New**: Shows blocking loading overlay if `config.showLoading` is true.
   - Response Interceptor: Unwraps `data`; handles global errors (401, 403, 500); prioritizes backend error messages; stops `NProgress`.
+    - **New**: Hides blocking loading overlay if `config.showLoading` is true.
   - Config: `showLoading`, `showError`.
 
 ### `src/service/api/auth.ts`
diff --git a/project_doing.md b/project_doing.md
index d2a9d6d..d1f9479 100644
--- a/project_doing.md
+++ b/project_doing.md
@@ -41,3 +41,11 @@
 - **Scope**:
     - `src/utils/message.ts` (Update logic to support multiple containers)
     - `src/components/ui/WMessage.vue` (No changes needed, styles handled by container)
+
+### [Task 4] Implement Fullscreen Loading
+- **Time**: 2025-12-18
+- **Goal**: Add blocking loading overlay controlled by request config.
+- **Scope**:
+    - `src/components/ui/WLoading.vue` (Create)
+    - `src/utils/loading.ts` (Create)
+    - `src/service/request/index.ts` (Update interceptors)
diff --git a/project_index.md b/project_index.md
index 62022df..fc288d1 100644
--- a/project_index.md
+++ b/project_index.md
@@ -1,11 +1,13 @@
 # Project File Index
 
 - `src/utils/message.ts`: Global message utility.
+- `src/utils/loading.ts`: Global loading utility (blocking overlay).
 - `src/service/request/index.ts`: Axios wrapper.
 - `src/service/api/auth.ts`: Authentication API.
 - `src/service/api/score.ts`: Score API.
 - `src/stores/user.ts`: User Pinia store.
 - `src/stores/score.ts`: Score Pinia store.
 - `src/components/ui/WMessage.vue`: Message component UI.
+- `src/components/ui/WLoading.vue`: Full-screen loading component UI.
 - `src/components/TheNavigation.vue`: Main navigation component.
 - `src/components/ScoreForm.vue`: Score editing form.
diff --git a/project_task.md b/project_task.md
index 537635c..369ae9e 100644
--- a/project_task.md
+++ b/project_task.md
@@ -25,3 +25,8 @@
 
 - [x] [Task 3] Enhance WMessage Component <!-- id: 21 -->
     - [x] Add position support to `src/utils/message.ts` (top/bottom/left/right/center) <!-- id: 22 -->
+
+- [x] [Task 4] Implement Fullscreen Loading <!-- id: 23 -->
+    - [x] Create `src/components/ui/WLoading.vue` <!-- id: 24 -->
+    - [x] Create `src/utils/loading.ts` logic <!-- id: 25 -->
+    - [x] Update `src/service/request/index.ts` to handle `showLoading` parameter <!-- id: 26 -->
diff --git a/public/download.png b/public/download.png
new file mode 100644
index 0000000..8344fb6
Binary files /dev/null and b/public/download.png differ
diff --git a/src/components.d.ts b/src/components.d.ts
index e2ea1d0..b8911dd 100644
--- a/src/components.d.ts
+++ b/src/components.d.ts
@@ -20,6 +20,7 @@ declare module 'vue' {
     TheFooter: typeof import('./components/TheFooter.vue')['default']
     TheInput: typeof import('./components/TheInput.vue')['default']
     TheNavigation: typeof import('./components/TheNavigation.vue')['default']
+    WLoading: typeof import('./components/ui/WLoading.vue')['default']
     WMessage: typeof import('./components/ui/WMessage.vue')['default']
     WOption: typeof import('./components/ui/WOption.vue')['default']
     WPopconfirm: typeof import('./components/ui/WPopconfirm.vue')['default']
diff --git a/src/components/LoginForm.vue b/src/components/LoginForm.vue
index 682b27e..8a60f0c 100644
--- a/src/components/LoginForm.vue
+++ b/src/components/LoginForm.vue
@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import { ref } from 'vue'
 import { useUserStore } from '~/stores/user'
+import { useScoreStore } from '~/stores/score'
 import { type LoginParams, type LoginResult } from '~/service/api/auth'
 import message from '~/utils/message'
 
 const userStore = useUserStore()
+const scoreStore = useScoreStore()
 
 // 定义 Emits
 const emit = defineEmits<{
@@ -30,6 +32,8 @@ async function handleLogin() {
     console.warn(loginResult)
     if (loginResult.token && loginResult.user) {
       message.success('登录成功')
+      // 获取分数信息
+      // scoreStore.fetchScore()
       // 抛出事件
       emit('confirm', loginResult)
     }
diff --git a/src/components/TheNavigation.vue b/src/components/TheNavigation.vue
index 84edb8d..ac13f37 100644
--- a/src/components/TheNavigation.vue
+++ b/src/components/TheNavigation.vue
@@ -74,6 +74,7 @@ function handleLoginConfirm(data: LoginResult) {
   console.warn('接收到登录数据:', data)
   if(data.user && data.token){
     closeLoginModal()
+    initScore()
   }
 }
 
diff --git a/src/components/ui/WLoading.vue b/src/components/ui/WLoading.vue
new file mode 100644
index 0000000..e5d39ea
--- /dev/null
+++ b/src/components/ui/WLoading.vue
@@ -0,0 +1,16 @@
+<script setup lang="ts">
+// Simple loading spinner component
+</script>
+
+<template>
+  <div class="fixed inset-0 z-[9999] flex items-center justify-center bg-black/20 backdrop-blur-sm transition-opacity duration-300">
+    <div class="bg-white/80 dark:bg-gray-800/80 rounded-lg p-4 shadow-xl flex flex-col items-center">
+      <div class="animate-spin text-blue-600 dark:text-blue-400">
+        <div class="i-carbon-circle-dash h-10 w-10" />
+      </div>
+      <div class="mt-2 text-sm font-medium text-gray-700 dark:text-gray-200">
+        加载中...
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/src/service/api/auth.ts b/src/service/api/auth.ts
index 40685d3..553be47 100644
--- a/src/service/api/auth.ts
+++ b/src/service/api/auth.ts
@@ -12,7 +12,7 @@ export interface LoginResult {
 }
 
 export function login(params: LoginParams) {
-  return request.post<LoginResult>('/user/auth/login', params)
+  return request.post<LoginResult>('/user/auth/login', params, { showLoading: true })
 }
 
 export function logout() {
diff --git a/src/service/api/score.ts b/src/service/api/score.ts
index 32b4501..bb035f0 100644
--- a/src/service/api/score.ts
+++ b/src/service/api/score.ts
@@ -31,9 +31,14 @@ export interface ScoreInfo {
 }
 
 export function saveScore(data: SaveScoreRequest) {
-  return request.post<ScoreInfo>('/user/score/save-score', data)
+  return request.post<ScoreInfo>('/user/score/save-score', data, {
+    showLoading: true
+  })
 }
 
 export function getScore() {
-  return request.get<ScoreInfo>('/user/score', {params: { educationalLevel: '' }, showLoading: false})
+  return request.get<ScoreInfo>('/user/score', {
+    params: { educationalLevel: '' },
+    showLoading: false,
+  })
 }
diff --git a/src/service/request/index.ts b/src/service/request/index.ts
index ae87a4b..ba7a26f 100644
--- a/src/service/request/index.ts
+++ b/src/service/request/index.ts
@@ -3,6 +3,7 @@ import NProgress from 'nprogress'
 import CryptoJS from 'crypto-js'
 import { useUserStore } from '~/stores/user'
 import message from '~/utils/message'
+import loading from '~/utils/loading'
 import { InternalAxiosRequestConfig } from 'axios'
 
 interface CustomRequestConfig extends InternalAxiosRequestConfig {
@@ -10,6 +11,11 @@ interface CustomRequestConfig extends InternalAxiosRequestConfig {
   showError?: boolean
 }
 
+interface RequestConfig extends AxiosRequestConfig {
+  showLoading?: boolean,
+  showError?: boolean
+}
+
 interface ApiResponse<T = any> {
   code: number
   message: string
@@ -24,37 +30,45 @@ class Request {
 
     // Request interceptor
     this.instance.interceptors.request.use(
-  (config: InternalAxiosRequestConfig & { showLoading?: boolean }) => {
-    const customConfig = config as CustomRequestConfig
-    
-    if (customConfig.showLoading !== false) {
-      NProgress.start()
-    }
-    const userStore = useUserStore()
-    customConfig.headers = customConfig.headers || {}
-    
-    if (userStore.token) {
-      customConfig.headers['Authorization'] = 'Bearer ' + userStore.token
-    }
-    // Add Signature
-    const timestamp = Date.now().toString()
-    const secret = import.meta.env.VITE_API_SECRET || ''
-    const sign = CryptoJS.MD5(timestamp + secret).toString()
-    customConfig.headers['X-App-Sign'] = sign
-    customConfig.headers['X-App-Timestamp'] = timestamp
-    return customConfig
-  },
-  (error) => {
-    return Promise.reject(error)
-  }
-)
+      (config: InternalAxiosRequestConfig & { showLoading?: boolean }) => {
+        const customConfig = config as CustomRequestConfig
+        
+        // NProgress runs by default for visual feedback
+        NProgress.start()
+
+        // Full screen blocking loading controlled by showLoading parameter
+        if (customConfig.showLoading) {
+          loading.show()
+        }
+
+        const userStore = useUserStore()
+        customConfig.headers = customConfig.headers || {}
+        
+        if (userStore.token) {
+          customConfig.headers['Authorization'] = 'Bearer ' + userStore.token
+        }
+        // Add Signature
+        const timestamp = Date.now().toString()
+        const secret = import.meta.env.VITE_API_SECRET || ''
+        const sign = CryptoJS.MD5(timestamp + secret).toString()
+        customConfig.headers['X-App-Sign'] = sign
+        customConfig.headers['X-App-Timestamp'] = timestamp
+        return customConfig
+      },
+      (error) => {
+        return Promise.reject(error)
+      }
+    )
 
     // Response interceptor
     this.instance.interceptors.response.use(
       (response: AxiosResponse<ApiResponse>) => {
         const config = response.config as CustomRequestConfig
-        if (config.showLoading !== false) {
-          NProgress.done()
+        
+        NProgress.done()
+        
+        if (config.showLoading) {
+          loading.hide()
         }
 
         const res = response.data
@@ -69,8 +83,11 @@ class Request {
       },
       (error) => {
         const config = error.config as CustomRequestConfig
-        if (config?.showLoading !== false) {
-          NProgress.done()
+        
+        NProgress.done()
+        
+        if (config?.showLoading) {
+          loading.hide()
         }
         
         let msg = 'Network Error'
@@ -101,43 +118,35 @@ class Request {
                     msg = backendMsg || 'Internal Server Error'
                     break
                 default:
-                    msg = backendMsg || error.message
+                    msg = backendMsg || `Error: ${error.response.status}`
             }
+        } else if (error.request) {
+            msg = 'No response from server'
         }
         
-        // if (config?.showError !== false) {
-        //   message.error(msg)
-        // }
-        // 返回包含具体错误信息的 Error 对象
-        return Promise.reject(new Error(msg))
+        if (config?.showError !== false) {
+            message.error(msg)
+        }
+        
+        return Promise.reject(error)
       }
     )
   }
 
-  request<T = any>(config: CustomRequestConfig): Promise<T> {
+  request<T = any>(config: RequestConfig): Promise<T> {
     return this.instance.request(config)
   }
 
-  get<T = any>(url: string, params?: any, config?: CustomRequestConfig): Promise<T> {
-    return this.instance.get(url, { ...config, params })
+  get<T = any>(url: string, config?: RequestConfig): Promise<T> {
+    return this.instance.get(url, config)
   }
 
-  post<T = any>(url: string, data?: any, config?: CustomRequestConfig): Promise<T> {
+  post<T = any>(url: string, data?: any, config?: RequestConfig): Promise<T> {
     return this.instance.post(url, data, config)
   }
-
-  put<T = any>(url: string, data?: any, config?: CustomRequestConfig): Promise<T> {
-    return this.instance.put(url, data, config)
-  }
-
-  delete<T = any>(url: string, config?: CustomRequestConfig): Promise<T> {
-    return this.instance.delete(url, config)
-  }
 }
 
-const request = new Request({
+export default new Request({
   baseURL: import.meta.env.VITE_API_BASE_URL,
   timeout: 10000,
 })
-
-export default request
diff --git a/src/utils/loading.ts b/src/utils/loading.ts
new file mode 100644
index 0000000..ba327b0
--- /dev/null
+++ b/src/utils/loading.ts
@@ -0,0 +1,37 @@
+import { createVNode, render } from 'vue'
+import WLoading from '~/components/ui/WLoading.vue'
+
+let loadingCount = 0
+let container: HTMLElement | null = null
+
+const startLoading = () => {
+  if (loadingCount === 0) {
+    container = document.createElement('div')
+    document.body.appendChild(container)
+    const vnode = createVNode(WLoading)
+    render(vnode, container)
+  }
+  loadingCount++
+}
+
+const endLoading = () => {
+  if (loadingCount <= 0) return
+  loadingCount--
+  if (loadingCount === 0 && container) {
+    // Add a small delay to prevent flickering if another request starts immediately
+    setTimeout(() => {
+      if (loadingCount === 0 && container) {
+        render(null, container)
+        container.remove()
+        container = null
+      }
+    }, 100)
+  }
+}
+
+export const loading = {
+  show: startLoading,
+  hide: endLoading,
+}
+
+export default loading