diff --git a/src/components/PlanDetail.vue b/src/components/PlanDetail.vue
index b65298e6..0ac2d60f 100644
--- a/src/components/PlanDetail.vue
+++ b/src/components/PlanDetail.vue
@@ -21,7 +21,7 @@
             <div>
               <template v-if="!isSubPlan">
                 <el-button class="button" type="primary" @click="savePlanContent" v-if="isEditingContent">保存</el-button>
-                <el-button class="button" @click="cancelEdit" v-if="isEditingContent">取消</el-button>
+                <el-button class="button" type="danger" @click="cancelEdit" v-if="isEditingContent">取消</el-button>
                 <el-button class="button" @click="enterEditMode" v-else>编辑内容</el-button>
               </template>
 
@@ -37,7 +37,7 @@
                   v-if="plan.content_type === 'tasks' || !plan.content_type"
                   type="primary"
                   size="small"
-                  @click="showAddTaskDialog"
+                  @click="showTaskEditorDialog()"
                 >增加子任务</el-button>
               </template>
             </div>
@@ -126,31 +126,31 @@
       </template>
     </el-dialog>
 
-    <!-- Add Task Dialog -->
+    <!-- Task Editor Dialog (for Add and Edit) -->
     <el-dialog
-      v-model="addTaskDialogVisible"
-      title="增加子任务"
+      v-model="taskEditorDialogVisible"
+      :title="isEditingTask ? '编辑子任务' : '增加子任务'"
       width="600px"
-      @close="resetAddTaskDialog"
+      @close="resetTaskEditorDialog"
     >
-      <el-form :model="newTaskForm" ref="newTaskFormRef" :rules="newTaskRules" label-width="100px">
+      <el-form :model="currentTaskForm" ref="taskFormRef" :rules="taskFormRules" label-width="100px">
         <el-form-item label="任务类型" prop="type">
-          <el-select v-model="newTaskForm.type" placeholder="请选择任务类型" style="width: 100%;">
+          <el-select v-model="currentTaskForm.type" placeholder="请选择任务类型" style="width: 100%;" :disabled="isEditingTask">
             <!-- Only Delay Task for now -->
             <el-option label="延时任务" value="delay_task"></el-option>
           </el-select>
         </el-form-item>
         <el-form-item label="任务名称" prop="name">
-          <el-input v-model="newTaskForm.name" placeholder="请输入任务名称"></el-input>
+          <el-input v-model="currentTaskForm.name" placeholder="请输入任务名称"></el-input>
         </el-form-item>
         <el-form-item label="任务描述" prop="description">
-          <el-input type="textarea" v-model="newTaskForm.description" placeholder="请输入任务描述"></el-input>
+          <el-input type="textarea" v-model="currentTaskForm.description" placeholder="请输入任务描述"></el-input>
         </el-form-item>
         <!-- Dynamic task component for specific parameters -->
-        <template v-if="newTaskForm.type === 'delay_task'">
+        <template v-if="currentTaskForm.type === 'delay_task'">
           <DelayTaskEditor
-            :parameters="newTaskForm.parameters"
-            @update:parameters="val => newTaskForm.parameters = val"
+            :parameters="currentTaskForm.parameters"
+            @update:parameters="val => currentTaskForm.parameters = val"
             prop-path="parameters.delay_duration"
             :is-editing="true" 
           />
@@ -159,8 +159,8 @@
       </el-form>
       <template #footer>
         <span class="dialog-footer">
-          <el-button @click="addTaskDialogVisible = false">取消</el-button>
-          <el-button type="primary" @click="confirmAddTask">确定</el-button>
+          <el-button @click="taskEditorDialogVisible = false">取消</el-button>
+          <el-button type="primary" @click="confirmTaskEdit">确定</el-button>
         </span>
       </template>
     </el-dialog>
@@ -207,26 +207,26 @@ export default {
       loading: false,
       error: null,
       isEditingContent: false,
-      originalPlanState: null, 
 
       // Add Sub-plan dialog
       addSubPlanDialogVisible: false,
       selectedSubPlanId: null,
       availablePlans: [],
 
-      // Add Task dialog
-      addTaskDialogVisible: false,
-      newTaskForm: {
+      // Task Editor dialog (for Add and Edit)
+      taskEditorDialogVisible: false, 
+      isEditingTask: false, 
+      editingTaskOriginalId: null, 
+      currentTaskForm: { 
         type: 'delay_task', 
         name: '',
         description: '',
-        parameters: { delay_duration: 1 }, // Initialize with delay_duration
+        parameters: {}, 
       },
-      newTaskRules: {
+      taskFormRules: { 
         type: [{ required: true, message: '请选择任务类型', trigger: 'change' }],
         name: [{ required: true, message: '请输入任务名称', trigger: 'blur' }],
-        // Add rule for delay_duration directly here, as it's the default type
-        'parameters.delay_duration': [{ required: true, message: '请输入延时时间', trigger: 'blur' }],
+        // Rule for delay_duration will be added/removed dynamically
       },
     };
   },
@@ -244,20 +244,22 @@ export default {
         }
       },
     },
-    'newTaskForm.type'(newType) {
-      // This watch is less critical now since delay_task is the only option
-      // but kept for extensibility.
+    'currentTaskForm.type'(newType) { 
+      console.log("PlanDetail: currentTaskForm.type changed to", newType);
       if (newType === 'delay_task') {
-        this.newTaskRules['parameters.delay_duration'] = this.delayDurationRules;
-        if (!this.newTaskForm.parameters.delay_duration) {
-          this.newTaskForm.parameters.delay_duration = 1;
+        this.taskFormRules['parameters.delay_duration'] = this.delayDurationRules;
+        if (this.currentTaskForm.parameters.delay_duration === undefined) {
+          this.currentTaskForm.parameters.delay_duration = 1;
+          console.log("PlanDetail: Initialized currentTaskForm.parameters.delay_duration to", this.currentTaskForm.parameters.delay_duration);
         }
       } else {
-        if (this.newTaskRules['parameters.delay_duration']) {
-          delete this.newTaskRules['parameters.delay_duration'];
+        if (this.taskFormRules['parameters.delay_duration']) {
+          delete this.taskFormRules['parameters.delay_duration'];
+          console.log("PlanDetail: Removed delay_duration rule.");
         }
-        if (this.newTaskForm.parameters.delay_duration) {
-          delete this.newTaskForm.parameters.delay_duration;
+        if (this.currentTaskForm.parameters.delay_duration !== undefined) {
+          delete this.currentTaskForm.parameters.delay_duration;
+          console.log("PlanDetail: Removed delay_duration parameter.");
         }
       }
     },
@@ -292,7 +294,7 @@ export default {
     },
     enterEditMode() {
       this.isEditingContent = true;
-      this.originalPlanState = JSON.parse(JSON.stringify(this.plan));
+      console.log("PlanDetail: Entered edit mode.");
     },
     async savePlanContent() {
       this.updateContentType(); 
@@ -304,7 +306,6 @@ export default {
           execution_type: this.plan.execution_type,
           execute_num: this.plan.execute_num,
           cron_expression: this.plan.cron_expression,
-          content_type: this.plan.content_type,
           sub_plan_ids: this.plan.content_type === 'sub_plans'
             ? this.plan.sub_plans.map(sp => sp.child_plan_id) 
             : [],
@@ -312,8 +313,7 @@ export default {
             ? this.plan.tasks.map((task, index) => ({
                 name: task.name,
                 description: task.description,
-                // Set type to 'waiting' for delay_task
-                type: task.type === 'delay_task' ? 'waiting' : task.type,
+                type: task.type,
                 execution_order: index + 1, 
                 parameters: task.parameters || {},
               }))
@@ -323,20 +323,20 @@ export default {
         delete submitData.execute_count;
         delete submitData.status;
 
+        console.log("PlanDetail: Submitting data", submitData);
         await apiClient.plans.update(this.planId, submitData);
         ElMessage.success('计划内容已保存');
         this.isEditingContent = false; 
-        this.originalPlanState = null; 
         this.fetchPlan(); 
       } catch (error) {
         ElMessage.error('保存计划内容失败: ' + (error.message || '未知错误'));
         console.error('保存计划内容失败:', error);
       }
     },
-    cancelEdit() {
-      this.plan = JSON.parse(JSON.stringify(this.originalPlanState));
+    async cancelEdit() {
+      console.log("PlanDetail: Cancelled edit, re-fetching plan.");
+      await this.fetchPlan();
       this.isEditingContent = false; 
-      this.originalPlanState = null; 
       ElMessage.info('已取消编辑');
     },
 
@@ -409,54 +409,119 @@ export default {
     },
 
     // --- Task related methods ---
-    async showAddTaskDialog() {
-      if (this.plan.sub_plans.length > 0) {
-        try {
-          await ElMessageBox.confirm('当前计划包含子计划，添加任务将清空现有子计划。是否继续？', '警告', {
+    showTaskEditorDialog(task = null) { 
+      console.log("PlanDetail: Showing task editor dialog.");
+      if (this.plan.sub_plans.length > 0 && !task) { 
+        ElMessageBox.confirm('当前计划包含子计划，添加任务将清空现有子计划。是否继续？', '警告', {
             confirmButtonText: '确定',
             cancelButtonText: '取消',
             type: 'warning'
+          }).then(() => {
+            this.plan.sub_plans = []; 
+            this.taskEditorDialogVisible = true;
+            this.prepareTaskForm(task);
+          }).catch(() => {
+            // User cancelled
           });
-          this.plan.sub_plans = []; 
-        } catch (e) {
           return;
-        }
       }
-      this.addTaskDialogVisible = true;
+      this.taskEditorDialogVisible = true;
+      this.prepareTaskForm(task);
     },
-    confirmAddTask() {
-      this.$refs.newTaskFormRef.validate(async (valid) => {
-        if (valid) {
-          const newTask = {
-            id: Date.now(), 
-            execution_order: this.plan.tasks.length + 1,
-            // Map 'delay_task' UI type to 'waiting' backend type
-            type: this.newTaskForm.type === 'delay_task' ? 'waiting' : this.newTaskForm.type,
-            name: this.newTaskForm.name,
-            description: this.newTaskForm.description,
-            parameters: this.newTaskForm.parameters, 
-          };
+    prepareTaskForm(task = null) {
+      // Reset properties of the existing reactive object
+      this.currentTaskForm.type = 'delay_task';
+      this.currentTaskForm.name = '';
+      this.currentTaskForm.description = '';
+      this.currentTaskForm.parameters = {}; // Ensure parameters is reset
 
-          this.plan.tasks.push(newTask);
+      if (task) {
+        this.isEditingTask = true;
+        this.editingTaskOriginalId = task.id;
+        // Update properties of the existing reactive object
+        this.currentTaskForm.type = task.type === 'waiting' ? 'delay_task' : task.type; // Convert backend type to UI type
+        this.currentTaskForm.name = task.name;
+        this.currentTaskForm.description = task.description;
+        // Deep copy parameters to ensure reactivity for nested changes
+        this.currentTaskForm.parameters = JSON.parse(JSON.stringify(task.parameters || {}));
+        console.log("PlanDetail: Prepared currentTaskForm for editing:", JSON.parse(JSON.stringify(this.currentTaskForm)));
+      } else {
+        this.isEditingTask = false;
+        this.editingTaskOriginalId = null;
+        // Properties are already reset above for new task mode
+        console.log("PlanDetail: Prepared currentTaskForm for adding:", JSON.parse(JSON.stringify(this.currentTaskForm)));
+      }
+      // Manually trigger watch for type to ensure rules and default parameters are set
+      this.updateTaskFormRules(); 
+      // Also, ensure delay_duration is initialized if it's a delay_task
+      if (this.currentTaskForm.type === 'delay_task' && this.currentTaskForm.parameters.delay_duration === undefined) {
+          this.currentTaskForm.parameters.delay_duration = 1;
+      }
+    },
+    updateTaskFormRules() {
+      // Clear existing dynamic rules
+      if (this.taskFormRules['parameters.delay_duration']) {
+        delete this.taskFormRules['parameters.delay_duration'];
+      }
+      // Apply rules based on current type
+      if (this.currentTaskForm.type === 'delay_task') {
+        this.taskFormRules['parameters.delay_duration'] = this.delayDurationRules;
+      }
+      console.log("PlanDetail: Updated taskFormRules:", JSON.parse(JSON.stringify(this.taskFormRules)));
+    },
+    confirmTaskEdit() { 
+      console.log("PlanDetail: confirmTaskEdit called. currentTaskForm before validation:", JSON.parse(JSON.stringify(this.currentTaskForm)));
+      this.$refs.taskFormRef.validate(async (valid) => {
+        console.log("PlanDetail: Form validation result:", valid);
+        if (valid) {
+          if (this.isEditingTask) {
+            // Find and update the existing task
+            const index = this.plan.tasks.findIndex(t => t.id === this.editingTaskOriginalId);
+            if (index !== -1) {
+              // Update properties of the existing task
+              this.plan.tasks[index].name = this.currentTaskForm.name;
+              this.plan.tasks[index].description = this.currentTaskForm.description;
+              this.plan.tasks[index].type = this.currentTaskForm.type === 'delay_task' ? 'waiting' : this.currentTaskForm.type;
+              this.plan.tasks[index].parameters = this.currentTaskForm.parameters;
+              ElMessage.success(`子任务 "${this.currentTaskForm.name}" 已更新`);
+            } else {
+              ElMessage.error('未找到要编辑的任务');
+            }
+          } else {
+            // Add a new task
+            const newTask = {
+              id: Date.now(), 
+              execution_order: this.plan.tasks.length + 1,
+              type: this.currentTaskForm.type === 'delay_task' ? 'waiting' : this.currentTaskForm.type,
+              name: this.currentTaskForm.name,
+              description: this.currentTaskForm.description,
+              parameters: this.currentTaskForm.parameters, 
+            };
+            this.plan.tasks.push(newTask);
+            ElMessage.success(`子任务 "${newTask.name}" 已添加`);
+          }
           this.updateContentType(); 
-          ElMessage.success(`子任务 "${newTask.name}" 已添加`);
-          this.addTaskDialogVisible = false;
-          this.resetAddTaskDialog();
+          this.taskEditorDialogVisible = false;
+          this.resetTaskEditorDialog();
         }
       });
     },
-    resetAddTaskDialog() {
-      this.$refs.newTaskFormRef.resetFields();
-      this.newTaskForm = {
-        type: 'delay_task', 
-        name: '',
-        description: '',
-        parameters: { delay_duration: 1 }, // Reset with default delay_duration
-      };
+    resetTaskEditorDialog() { 
+      console.log("PlanDetail: Resetting task editor dialog.");
+      this.$refs.taskFormRef.resetFields();
+      this.isEditingTask = false;
+      this.editingTaskOriginalId = null;
+      // Manually reset properties to ensure clean state for next use
+      this.currentTaskForm.type = 'delay_task'; 
+      this.currentTaskForm.name = '';
+      this.currentTaskForm.description = '';
+      this.currentTaskForm.parameters = {}; 
+      console.log("PlanDetail: currentTaskForm after full reset:", JSON.parse(JSON.stringify(this.currentTaskForm)));
+      this.updateTaskFormRules(); 
     },
-    editTask(task) {
-      ElMessage.info('编辑任务功能正在开发中');
-      console.log('编辑任务:', task);
+    editTask(task) { 
+      console.log('PlanDetail: Calling showTaskEditorDialog for editing task:', task);
+      this.showTaskEditorDialog(task);
     },
     deleteTask(taskToDelete) {
       ElMessageBox.confirm(`确认删除任务 "${taskToDelete.name}" 吗？`, '提示', {