diff --git a/src/components/StartTask.vue b/src/components/StartTask.vue
index 801f754..c7fd56e 100644
--- a/src/components/StartTask.vue
+++ b/src/components/StartTask.vue
@@ -1,12 +1,11 @@
 <!-- src/views/StudyTimer.vue -->
 <script setup lang="ts">
-import { ref, computed, onMounted } from 'vue';
+import { ref, computed, onMounted, onUnmounted } from 'vue';
 import { useRoute } from 'vue-router';
 import {ElMessage, ElMessageBox} from 'element-plus';
 import { useTimer } from '@/components/composables/useTimer';
 import { continueSession, pauseSession, endSession, startOrContinueStudySession } from '@/api/studySessions';
 import { useStudyFragment } from '@/components/composables/fragment';
-import {routes} from "vue-router/auto-routes";
 import router from "@/router";
 
 const {
@@ -49,27 +48,6 @@ const {
   requestAudioPermission
 } = useTimer();
 
-const globalTimer = ref(Date.now());
-
-const currentCycle = computed(() =>
-    Math.floor(taskInfo.value.effectiveTime / 60 / 25) + 1
-);
-
-const elapsedTime = computed(() => {
-  if (!taskInfo.value.startTime || !timerRunning.value) return { hours: 0, minutes: 0, seconds: 0 };
-  const start = new Date(taskInfo.value.startTime).getTime();
-  const now = globalTimer.value;
-  const diff = Math.max(Math.floor((now - start) / 1000), 0);
-  return {
-    hours: Math.floor(diff / 3600),
-    minutes: Math.floor((diff % 3600) / 60),
-    seconds: diff % 60,
-  };
-});
-
-const formatTime = (t: { hours: number; minutes: number; seconds: number }) =>
-    `${t.hours}时${t.minutes}分${t.seconds}秒`;
-
 const progress = computed(() =>
     ((timerMinutes.value * 60 + timerSeconds.value) / (25 * 60)) * 100
 );
@@ -152,24 +130,33 @@ const initPage = async () => {
     }
   }
   await loadTaskSession();
-
-  setInterval(() => {
-    globalTimer.value = Date.now();
-  }, 1000);
 };
 
 onMounted(() => {
   initPage();
 });
+
+onUnmounted(() => {
+  clear();
+});
 </script>
 
 <template>
   <div class="task-container">
+    <el-alert
+      v-if="taskInfo.systemMessage"
+      :title="taskInfo.systemMessage"
+      type="warning"
+      show-icon
+      :closable="false"
+      class="session-alert"
+    />
     <div class="task-info">
       <p>当前任务【{{ taskInfo.taskName }}】</p>
-      <p>当前循环：{{ currentCycle }}</p>
-      <p>有效时间：{{ taskInfo.effectiveTime / 60 }}分钟</p>
-      <p>本次运行时间：{{ formatTime(elapsedTime) }}</p>
+      <p>会话状态：{{ taskInfo.sessionState }}</p>
+      <p>实际用时：{{ taskInfo.actualTime }}</p>
+      <p>有效学习时长：{{ taskInfo.effectiveTime }}</p>
+      <p>有效时间比：{{ taskInfo.effectivenessRatio }}</p>
     </div>
     <div class="timer-section">
       <el-progress type="circle" :percentage="progress" :width="200">
@@ -225,6 +212,10 @@ onMounted(() => {
   justify-content: center;
   margin: 20px;
 }
+.session-alert {
+  margin-bottom: 16px;
+  max-width: 500px;
+}
 .task-info {
   font-size: 18px;
   margin-bottom: 30px;
diff --git a/src/components/Study.vue b/src/components/Study.vue
index 413996e..001c4e4 100644
--- a/src/components/Study.vue
+++ b/src/components/Study.vue
@@ -15,8 +15,9 @@ const fetchTasks = () => {
         tasks.splice(0, tasks.length, ...res.data.records.map((record: any) => ({
           title: record.taskName,
           description: record.taskDescription || '',
+          materialURL: record.materialURL || record.materialUrl || "",
           lastLearningStatus: record.lastLearningStatus || '未开始',
-          priority: Math.round(record.taskPriority),
+          priority: Number.isFinite(record.taskPriority) ? Math.round(record.taskPriority) : "-",
           taskNum: record.taskNum,
           taskId: record.id,
         })));
@@ -25,8 +26,11 @@ const fetchTasks = () => {
 };
 
 const startTask = () => {
+  if (!selectedTask.value) {
+    ElMessage.warning("请先选择一个任务");
+    return;
+  }
   router.push({name:'start-task',params:{taskNum:selectedTask.value.taskNum}});
-  console.log('任务已开始：', selectedTask.value);
 };
 
 const addTask = () => {
@@ -34,21 +38,28 @@ const addTask = () => {
 };
 
 const changeTask = () =>{
+  if (!selectedTask.value) {
+    ElMessage.warning("请先选择一个任务");
+    return;
+  }
   router.push({name:"update-task",params:{"taskId":selectedTask.value.taskId}})
 };
 
 const removeTask = () => {
+  if (!selectedTask.value) {
+    ElMessage.warning("请先选择一个任务");
+    return;
+  }
   request.del(`/tasks/${selectedTask.value.taskId}`,{}).then(res=>{
-    if (res.code == '200'){
+    if (res.code === 200){
       ElMessage.success(`任务${selectedTask.value.title}删除成功`)
+      const index = tasks.indexOf(selectedTask.value);
+      if (index > -1) {
+        tasks.splice(index, 1);
+        selectedTask.value = tasks[0] || null;
+      }
     }
   });
-
-  const index = tasks.indexOf(selectedTask.value);
-  if (index > -1) {
-    tasks.splice(index, 1);
-    selectedTask.value = tasks[0] || null;
-  }
 };
 
 const selectTask = (task: any) => {
@@ -84,12 +95,16 @@ onMounted(() => {
       <el-card class="task-card">
         <div v-if="selectedTask">
           <h3>任务描述</h3>
-          <el-input type="textarea" v-model="selectedTask.description" :rows="4" />
+          <el-input type="textarea" :model-value="selectedTask.description" :rows="4" readonly />
+
+          <h3 class="section-title">学习材料</h3>
+          <el-link v-if="selectedTask.materialURL" :href="selectedTask.materialURL" type="primary" target="_blank">
+            {{ selectedTask.materialURL }}
+          </el-link>
+          <span v-else>未填写材料地址</span>
 
           <h3 class="section-title">任务优先级</h3>
-          <el-radio-group v-model="selectedTask.priority">
-            <el-radio-button v-for="i in 6" :label="i - 1" :key="i">{{ i - 1 }}</el-radio-button>
-          </el-radio-group>
+          <el-tag type="info">综合优先级：{{ selectedTask.priority }}</el-tag>
 
           <h3 class="section-title">上次该任务学习情况</h3>
           <el-descriptions border column="1">
diff --git a/src/utils/request.ts b/src/utils/request.ts
index 32d488a..ad1f22e 100644
--- a/src/utils/request.ts
+++ b/src/utils/request.ts
@@ -11,10 +11,19 @@ const axiosInstance = axios.create({
 
 const handleError = (error: any) => {
     console.log(error);
+
+    // 业务异常由 validateResponse 负责提示，这里透传，避免被网络错误文案覆盖。
+    if (error && typeof error === "object" && "code" in error) {
+        return Promise.reject(error);
+    }
+
     if (error.response) {
-        ElMessage.error(`请求失败，服务器返回: ${error.response.data}`);
+        const backendMessage = error.response?.data?.message || JSON.stringify(error.response?.data);
+        ElMessage.error(`请求失败，服务器返回: ${backendMessage}`);
     } else if (error.request) {
         ElMessage.error("请求未收到响应，请检查接口运行状态");
+    } else {
+        ElMessage.error(error.message || "请求失败");
     }
     throw new Error("网络不通畅，请检查您的网络连接或服务器状态");
 };
@@ -61,7 +70,7 @@ const put = (url: string, data: any, config: any = {}) => {
         .catch(handleError);
 };
 
-const del = (url: string, params: {}, config: any = {}) => {
+const del = (url: string, params: Record<string, any> = {}, config: any = {}) => {
     console.log("开始DELETE请求", basic_url + url, "参数：", params);
     return axiosInstance.delete(url, { params, ...config })
         .then(validateResponse)