diff --git a/src/views/examPaper/index.vue b/src/views/examPaper/index.vue
index dda8899..5f4077e 100644
--- a/src/views/examPaper/index.vue
+++ b/src/views/examPaper/index.vue
@@ -412,6 +412,9 @@ const usbAlertVisible = ref(false)
 const fileAlertVisible = ref(false)
 const usbAlertMsg = ref('')
 const fileAlertMsg = ref('')
+// 用于保持全屏的定时器 id（检测到 U 盘 / 文件共享后周期性确保全屏）
+const usbFullscreenInterval = ref(null)
+const fileFullscreenInterval = ref(null)
 const networkStatus = ref('强') // 网络信号强度
 const uploadStatus = ref(1) // 上传状态 (0: 上传; 1: 不上传)
 const isMinView = computed(() => examStore.isMinView)
@@ -467,13 +470,24 @@ const connectUsbWs = (server = 'localhost:48082') => {
       if (msg.includes('检测到') && msg.includes('U盘')) {
         usbAlertMsg.value = msg
         usbAlertVisible.value = true
+        // 立即尝试设置全屏，并启动定时器持续确保全屏状态
         ;(async () => {
           try {
-            await WindowManager.setAlwaysOnTop(true)
+            await getCurrentWindow().setFullscreen(true)
           } catch (e) {
             console.warn('设置全屏/置顶失败:', e)
           }
         })()
+        if (!usbFullscreenInterval.value) {
+          // 每 3 秒重复确保全屏，直到收到关闭消息
+          usbFullscreenInterval.value = setInterval(() => {
+            getCurrentWindow()
+              .setFullscreen(true)
+              .catch(() => {
+                /* 忽略失败，下一次重试 */
+              })
+          }, 3000)
+        }
       }
       // 关闭提示的协议（后端返回 COLSEUSB）
       if (msg.includes('COLSEUSB') || msg.includes('CLOSEUSB')) {
@@ -481,7 +495,14 @@ const connectUsbWs = (server = 'localhost:48082') => {
         usbAlertMsg.value = ''
         ;(async () => {
           try {
-            await WindowManager.setAlwaysOnTop(false)
+            // 停止保持全屏的定时器
+            if (usbFullscreenInterval.value) {
+              clearInterval(usbFullscreenInterval.value)
+              usbFullscreenInterval.value = null
+            }
+            if (examStore.isAnswerView) {
+              await getCurrentWindow().setFullscreen(false)
+            }
           } catch (e) {}
         })()
       }
@@ -507,20 +528,37 @@ const connectFileWs = (server = 'localhost:48082') => {
       if (msg.includes('检测到') && msg.includes('文件共享')) {
         fileAlertMsg.value = msg
         fileAlertVisible.value = true
+        // 立即尝试设置全屏，并启动定时器持续确保全屏状态
         ;(async () => {
           try {
-            await WindowManager.setAlwaysOnTop(true)
+            await getCurrentWindow().setFullscreen(true)
           } catch (e) {
             console.warn('设置全屏/置顶失败:', e)
           }
         })()
+        if (!fileFullscreenInterval.value) {
+          fileFullscreenInterval.value = setInterval(() => {
+            getCurrentWindow()
+              .setFullscreen(true)
+              .catch(() => {
+                /* 忽略失败，下一次重试 */
+              })
+          }, 3000)
+        }
       }
       if (msg.includes('COLSEFILE') || msg.includes('CLOSEFILE')) {
         fileAlertVisible.value = false
         fileAlertMsg.value = ''
         ;(async () => {
           try {
-            await WindowManager.setAlwaysOnTop(false)
+            // 停止保持全屏的定时器
+            if (fileFullscreenInterval.value) {
+              clearInterval(fileFullscreenInterval.value)
+              fileFullscreenInterval.value = null
+            }
+            if (examStore.isAnswerView) {
+              await getCurrentWindow().setFullscreen(false)
+            }
           } catch (e) {}
         })()
       }
@@ -1768,7 +1806,7 @@ const openQuestionFile = async () => {
   // 检测无关环境
   try {
     const whitelist = await AppCloseWhitelistApi()
-    AppAllApi().then(({ data: { data } }) => {
+    AppAllApi().then(async ({ data: { data } }) => {
       // 将data过滤掉checkCloseWhitelist中的值
       const newData = JSON.parse(data)
 
@@ -2128,7 +2166,7 @@ const checkCloseWhitelist = ref([])
 const handleBackView = async () => {
   try {
     const whitelist = await AppCloseWhitelistApi()
-    AppAllApi().then(({ data: { data } }) => {
+    AppAllApi().then(async ({ data: { data } }) => {
       // 将data过滤掉checkCloseWhitelist中的值
       const newData = JSON.parse(data)
 
@@ -2160,11 +2198,35 @@ const handleBackView = async () => {
         openDialog() // 打开对话框
       } else {
         // 在这里执行确定按钮的逻辑
-        examStore.setIsAnswerView(false) // 设置为非答题模式
-        // 当前窗口全屏
-        getCurrentWindow().setSize(new LogicalSize(1280, 720))
-        getCurrentWindow().setFullscreen(!examStore.isAnswerView)
-        WindowManager.setAlwaysOnTop(false) // 设置窗口在最上层
+        // 先清理可能存在的保持全屏定时器，避免竞态（例如刚收到 COLSEUSB 后遗留）
+        try {
+          if (usbFullscreenInterval.value) {
+            clearInterval(usbFullscreenInterval.value)
+            usbFullscreenInterval.value = null
+          }
+          if (fileFullscreenInterval.value) {
+            clearInterval(fileFullscreenInterval.value)
+            fileFullscreenInterval.value = null
+          }
+        } catch (e) {
+          console.warn('清理保持全屏定时器失败:', e)
+        }
+
+        // 设置为非答题模式并确保窗口为全屏
+        examStore.setIsAnswerView(false)
+        // 先设置窗口大小再进入全屏，使用 await 保证顺序
+        await getCurrentWindow().setSize(new LogicalSize(1280, 720))
+        try {
+          await getCurrentWindow().setFullscreen(true)
+        } catch (e) {
+          console.warn('设置全屏失败 in handleBackView:', e)
+        }
+        // 确保取消置顶（若有）
+        try {
+          await WindowManager.setAlwaysOnTop(false)
+        } catch (e) {
+          // 忽略 WindowManager 的错误
+        }
       }
     })
   } catch (error) {
@@ -2566,6 +2628,20 @@ onUnmounted(() => {
     console.warn('关闭检测 WS 时出错:', e)
   }
 
+  // 清理保持全屏的定时器（如果存在）
+  try {
+    if (usbFullscreenInterval.value) {
+      clearInterval(usbFullscreenInterval.value)
+      usbFullscreenInterval.value = null
+    }
+    if (fileFullscreenInterval.value) {
+      clearInterval(fileFullscreenInterval.value)
+      fileFullscreenInterval.value = null
+    }
+  } catch (e) {
+    console.warn('清理全屏定时器时出错:', e)
+  }
+
   // 恢复安全模式默认（取消强制全屏、取消截屏拦截）
   try {
     keyboardDisabler.updateConfig({ enableSecurityMode: false })