diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/dto/TaskTrendDTO.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/dto/TaskTrendDTO.java
new file mode 100644
index 0000000..7213909
--- /dev/null
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/dto/TaskTrendDTO.java
@@ -0,0 +1,34 @@
+package cn.edu.hfut.rmdjzz.projectmanagement.entity.dto;
+
+import cn.edu.hfut.rmdjzz.projectmanagement.entity.Task;
+import lombok.Data;
+import lombok.NonNull;
+
+import java.time.LocalDate;
+import java.util.Objects;
+
+/**
+ * @author 阳勇权
+ * @since 2022/7/8 15:40
+ */
+@Data
+public class TaskTrendDTO {
+    LocalDate taskDate;
+    String taskStatus;
+    Long taskNum;
+
+    public void changeForUnclosed(TaskTrendDTO taskTrend) {
+        if(Objects.equals(Task.STATUS_UNCLOSED, taskStatus)) {
+            taskNum += taskTrend.getTaskNum();
+        }
+    }
+    public void changeForClosed(TaskTrendDTO taskTrend) {
+        if(Objects.equals(Task.STATUS_UNCLOSED, taskStatus)) {
+            taskNum -= taskTrend.getTaskNum();
+        } else {
+            if(Objects.equals(taskTrend.getTaskStatus(), taskStatus)) {
+                taskNum += taskTrend.getTaskNum();
+            }
+        }
+    }
+}