diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
index 79254b4..53a075f 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
@@ -71,6 +71,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         }
         try {
             List<Long> res = new ArrayList<>();
+            // 添加根任务点Id，获得子节点数目
             res.add(taskId);
             Task task = baseMapper.selectOne(Wrappers.<Task>lambdaQuery().eq(Task::getTaskId, taskId));
             Task fatherTask = baseMapper.selectOne(Wrappers.<Task>lambdaQuery().eq(Task::getTaskId, task.getTaskFatherId()));
@@ -79,14 +80,18 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
             if (baseMapper.update(fatherTask, Wrappers.<Task>lambdaQuery().eq(Task::getTaskId, fatherTask.getTaskId())) != 1) {
                 throw new BadRequestException("删除失败");
             }
-            while (true) {
+            // 每次按照广度优先搜索的方式，按照树形的任务结构向下层寻找
+            for(int depth = 1; depth <= 20; depth++) {
+                // 寻找下一层的所有任务
                 List<Task> list = baseMapper.selectList(
                         Wrappers.<Task>lambdaQuery()
                                 .in(Task::getTaskFatherId, res));
+                // 删除这一层的所有任务
                 baseMapper.update(null, Wrappers.<Task>lambdaUpdate().in(Task::getTaskId, res).set(Task::getChildrenCount, 0));
                 baseMapper.delete(Wrappers.<Task>lambdaQuery().in(Task::getTaskId, res));
-
+                // 该层为空
                 if (list == null || list.isEmpty()) break;
+                // 获得下一层的任务id
                 res = list.stream().map(Task::getTaskId).collect(Collectors.toList());
             }
             return true;
@@ -108,14 +113,17 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         }
         try {
             List<Long> res = new ArrayList<>();
+            // 获得初始的任务Id
             res.add(taskId);
-            while (true) {
+            for(int depth = 1; depth <= 20; depth++) {
+                // 获得下一层所有任务
                 List<Task> list = baseMapper.selectList(
                         Wrappers.<Task>lambdaQuery()
                                 .in(Task::getTaskFatherId, res)
                                 .ne(Task::getTaskStatus, Task.STATUS_COMPLETED)
                                 .ne(Task::getTaskStatus, Task.STATUS_CLOSED)
                 );
+                // 修改该层任务，为关闭状态
                 baseMapper.update(
                         null,
                         Wrappers.<Task>lambdaUpdate()
@@ -124,6 +132,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
                                 .set(Task::getTaskClosedTime, LocalDateTime.now())
                 );
                 if (list == null || list.isEmpty()) break;
+                // 获得下一层的任务Id
                 res = list.stream().map(Task::getTaskId).collect(Collectors.toList());
             }
             return true;
@@ -359,17 +368,22 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         return task;
     }
 
+    // 完成任务数目概况统计
     @Override
     public Map<String, List<TaskTrendDTO>> getProjectTaskTrend(String token, Integer projectId) throws ForbiddenException {
         if (projectGroupService.getProjectAccessLevel(token, projectId) == 0) {
             throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
         }
+        // 起止日期
         LocalDate endDate = LocalDate.now();
         LocalDate startDate = endDate.plusDays(-14);
+        // 返回结果
         Map<String, List<TaskTrendDTO>> res = new HashMap<>();
 
+        // 获得开始时间之前的所有任务的数据
         List<TaskTrendDTO> resList = getResultTaskStatus(projectId, startDate);
 
+        // 分别获得该项目在起止时间之间所有未关闭的和关闭的任务任务
         TaskTrendDTO lastTaskTrend = new TaskTrendDTO();
         lastTaskTrend.setTaskDate(endDate.plusDays(1));
         List<TaskTrendDTO> unclosedList = baseMapper.selectTaskUnclosedNum(projectId, startDate, endDate);
@@ -377,6 +391,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         List<TaskTrendDTO> closedList = baseMapper.selectTaskClosedNum(projectId, startDate, endDate);
         closedList.add(lastTaskTrend);
 
+        // 各个状态分别进行统计
         for (TaskTrendDTO iterTask : resList) {
             List<TaskTrendDTO> taskList = new ArrayList<>();
             ListIterator<TaskTrendDTO> closedIter = closedList.listIterator();
@@ -384,9 +399,11 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
             TaskTrendDTO closedTaskTrend = null;
             TaskTrendDTO unclosedTaskTrend = null;
 
+            // 关闭与未关闭的任务的中间累加对象
             closedTaskTrend = closedIter.next();
             unclosedTaskTrend = unclosedIter.next();
 
+            //按照时间顺序进行统计
             Long lastNum = iterTask.getTaskNum();
             LocalDate iterDate = startDate;
             while (!iterDate.isAfter(endDate)) {
@@ -394,29 +411,26 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
                 taskTrend.setTaskDate(iterDate);
                 taskTrend.setTaskStatus(iterTask.getTaskStatus());
                 taskTrend.setTaskNum(lastNum);
-                while (true) {
-                    if (iterDate.isBefore(unclosedTaskTrend.getTaskDate())) {
-                        break;
-                    }
+                // 将之前日期之前的所有统计数据叠加
+                while (iterDate.isBefore(unclosedTaskTrend.getTaskDate())) {
                     taskTrend.changeForUnclosed(unclosedTaskTrend);
                     if (unclosedIter.hasNext()) {
                         unclosedTaskTrend = unclosedIter.next();
                     }
                 }
-                while (true) {
-                    if (iterDate.isBefore(closedTaskTrend.getTaskDate())) {
-                        break;
-                    }
+                while (iterDate.isBefore(closedTaskTrend.getTaskDate())) {
                     taskTrend.changeForClosed(closedTaskTrend);
                     if (closedIter.hasNext()) {
                         closedTaskTrend = closedIter.next();
                     }
                 }
+                // 将统计数据放入返回值时
                 taskList.add(taskTrend);
                 iterDate = iterDate.plusDays(1);
                 lastNum = taskTrend.getTaskNum();
 //                log.debug(taskTrend.toString());
             }
+            // 各个状态返回
             res.put(iterTask.getTaskStatus(), taskList);
         }
         return res;