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 53b3958..0f8ea27 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
@@ -136,12 +136,12 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
     @NotNull
     private void addResultProjectProcess(List<StaffProcessDTO> resList, String projectType) {
         Boolean typeExist = false;
-        for(StaffProcessDTO staffProcessDTO: resList) {
-            if(Objects.equals(staffProcessDTO.getTaskType(), projectType)) {
+        for (StaffProcessDTO staffProcessDTO : resList) {
+            if (Objects.equals(staffProcessDTO.getTaskType(), projectType)) {
                 typeExist = true;
             }
         }
-        if(!typeExist) {
+        if (!typeExist) {
             StaffProcessDTO staffProcessDTO = new StaffProcessDTO();
             staffProcessDTO.setTaskType(projectType);
             staffProcessDTO.setCompleteNum(0L);
@@ -186,16 +186,56 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
         return getHolderLevel(staffId, staffGlobalLevel, taskId);
     }
 
+    private int lowerBound(List<Task> data, long x) {
+        int l = 0, r = data.size() - 1;
+        while (l < r) {
+            int mid = (l + r) / 2;
+            if (data.get(mid).getTaskFatherId() >= x) r = mid;
+            else l = mid + 1;
+        }
+        return l;
+    }
+
+    private int upperBound(List<Task> data, long x) {
+        int l = 0, r = data.size() - 1;
+        while (l < r) {
+            int mid = (l + r) / 2;
+            if (data.get(mid).getTaskFatherId() <= x) l = mid + 1;
+            else r = mid;
+        }
+        return l - 1;
+    }
+
+
     @Override
     public List<Task> listMyTasks(String token, Integer projectId) throws BadRequestException {
-        if (projectGroupService.getProjectAccessLevel(token, projectId) == 0) {
-            throw new BadRequestException(IProjectGroupService.UNABLE_TO_ACCESS_PROJECT);
-        }
         Integer staffId = TokenUtils.getStaffId(token);
-        return baseMapper.selectList(Wrappers.<Task>lambdaQuery()
-                .eq(Task::getTaskHolderId, staffId)
-                .eq(Task::getTaskProjectId, projectId)
-        );
+        List<Task> resList = baseMapper.selectList(Wrappers.<Task>lambdaQuery().select(Task::getTaskId, Task::getTaskFatherId, Task::getTaskHolderId)
+                .eq(Task::getTaskProjectId, projectId).orderByAsc(Task::getTaskFatherId));
+        List<Long> results = new ArrayList<>();
+        ArrayList<Long> vec = new ArrayList<>();
+        ArrayList<Boolean> isTarget = new ArrayList<>();
+        vec.add(0L);
+        isTarget.add(false);
+        int id = 0;
+        while (id != vec.size()) {
+            Long pos = vec.get(id);
+            Boolean flag = isTarget.get(id);
+            id++;
+            if (flag) {
+                results.add(pos);
+                continue;
+            }
+            int l = lowerBound(resList, pos);
+            int r = upperBound(resList, pos);
+            if (l > r)
+                continue;
+            for (int i = l; i <= r; i++) {
+                vec.add(resList.get(i).getTaskId());
+                isTarget.add(resList.get(i).getTaskHolderId().equals(staffId));
+            }
+        }
+        return baseMapper.selectList(Wrappers.<Task>lambdaQuery().in(Task::getTaskId, results));
     }
 
     @Override