diff --git a/src/main/java/com/example/newgroupshell/common/Constants.java b/src/main/java/com/example/newgroupshell/common/Constants.java
new file mode 100644
index 0000000000000000000000000000000000000000..2d1b056d76177e12d3171e0c27431c7c6750c21d
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/common/Constants.java
@@ -0,0 +1,7 @@
+package com.example.newgroupshell.common;
+
+//common包放置枚举与常量等通用数据类型
+
+public interface Constants {
+    String USER_DEFAULT_PASSWORD = "123456";
+}
diff --git a/src/main/java/com/example/newgroupshell/common/enums/TaskStatusEnum.java b/src/main/java/com/example/newgroupshell/common/enums/TaskStatusEnum.java
new file mode 100644
index 0000000000000000000000000000000000000000..06cf357b35ebdee9331eb5ab8e51924f547b3f27
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/common/enums/TaskStatusEnum.java
@@ -0,0 +1,8 @@
+package com.example.newgroupshell.common.enums;
+
+public enum TaskStatusEnum {
+    PENDING, //待处理
+    IN_PROGRESS, //进行中
+    COMPLETED, //已完成
+    DELAYED //已延期
+}
diff --git a/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java b/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java
new file mode 100644
index 0000000000000000000000000000000000000000..e1e1744c794e2a1f6c695becf8612d6acd945cbf
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/mapper/TaskMapper.java
@@ -0,0 +1,23 @@
+package com.example.newgroupshell.mapper;
+
+
+import com.example.newgroupshell.common.enums.TaskStatusEnum;
+import com.example.newgroupshell.pojo.Task;
+import org.apache.ibatis.annotations.*;
+
+import java.util.List;
+
+@Mapper
+public interface TaskMapper {
+    int insertTask(Task task);
+
+    int updateTaskById(Task task);
+
+    int deleteTaskById(@Param("tid") Integer tid);
+
+    List<Task> findTasksByAssigneeId(@Param("assigneeId") Integer assigneeId);
+
+    List<Task> findTasksByCreatorId(@Param("creatorId") Integer creatorId);
+
+    List<Task> findTasksByStatus(@Param("status") TaskStatusEnum status);
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/newgroupshell/pojo/Task.java b/src/main/java/com/example/newgroupshell/pojo/Task.java
new file mode 100644
index 0000000000000000000000000000000000000000..38244cc28e7715ffc4178bbf74351cf0311329be
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/pojo/Task.java
@@ -0,0 +1,76 @@
+package com.example.newgroupshell.pojo;
+
+import com.example.newgroupshell.common.enums.TaskStatusEnum;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+
+import java.time.LocalDateTime;
+
+/**
+ * Task class represents a task with its attributes and methods.
+ *
+ * @author Eric
+ * @version 1.0
+ */
+@Data
+@ToString
+@NoArgsConstructor
+@AllArgsConstructor
+public class Task {
+    /**
+     * The unique identifier of the task.
+     */
+    private Integer tid;
+
+    /**
+     * The title of the task.
+     */
+    private String title;
+
+    /**
+     * The description of the task.
+     */
+    private String description;
+
+    /**
+     * The time when the task was created.
+     */
+    private LocalDateTime createdTime;
+
+    /**
+     * The time when the task was last updated.
+     */
+    private LocalDateTime updatedTime;
+
+    /**
+     * The time when the task is scheduled to start.
+     */
+    private LocalDateTime startTime;
+
+    /**
+     * The deadline for the task.
+     */
+    private LocalDateTime deadline; //TODO:deadline必须比startTime迟
+
+    /**
+     * The ID of the assignee responsible for the task.
+     */
+    private Integer assigneeId;
+
+    /**
+     * The ID of the creator of the task.
+     */
+    private Integer creatorId;
+
+    /**
+     * The priority level of the task.
+     */
+    private Integer priority;
+
+    /**
+     * The status of the task.
+     */
+    private TaskStatusEnum status;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/newgroupshell/service/TaskService.java b/src/main/java/com/example/newgroupshell/service/TaskService.java
new file mode 100644
index 0000000000000000000000000000000000000000..f38c31fdede77541d1c181590ea2f435ed554be4
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/service/TaskService.java
@@ -0,0 +1,20 @@
+package com.example.newgroupshell.service;
+
+import com.example.newgroupshell.common.enums.TaskStatusEnum;
+import com.example.newgroupshell.pojo.Task;
+
+import java.util.List;
+
+public interface TaskService {
+    Task createTask(Task task);
+
+    Task updateTask(Task task);
+
+    boolean deleteTask(Integer taskId);
+
+    List<Task> listTasksByCreator(Integer creatorId);
+
+    List<Task> listTasksByAssignee(Integer assigneeId);
+
+    List<Task> listTasksByStatus(TaskStatusEnum status);
+}
diff --git a/src/main/java/com/example/newgroupshell/service/impl/TaskServiceImpl.java b/src/main/java/com/example/newgroupshell/service/impl/TaskServiceImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..a59e99bdfcd902ed1d26adf91fa0d922ad94e46a
--- /dev/null
+++ b/src/main/java/com/example/newgroupshell/service/impl/TaskServiceImpl.java
@@ -0,0 +1,52 @@
+package com.example.newgroupshell.service.impl;
+
+import com.example.newgroupshell.common.enums.TaskStatusEnum;
+import com.example.newgroupshell.mapper.TaskMapper;
+import com.example.newgroupshell.pojo.Task;
+import com.example.newgroupshell.service.TaskService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Service
+public class TaskServiceImpl implements TaskService {
+    @Autowired
+    private TaskMapper taskMapper;
+
+    @Override
+    public Task createTask(Task task) {
+        task.setCreatedTime(LocalDateTime.now());
+        task.setUpdatedTime(LocalDateTime.now());
+        taskMapper.insertTask(task);
+        return task;
+    }
+
+    @Override
+    public Task updateTask(Task task) {
+        task.setUpdatedTime(LocalDateTime.now());
+        taskMapper.updateTaskById(task);
+        return task;
+    }
+
+    @Override
+    public boolean deleteTask(Integer taskId) {
+        return taskMapper.deleteTaskById(taskId) > 0;
+    }
+
+    @Override
+    public List<Task> listTasksByCreator(Integer creatorId) {
+        return taskMapper.findTasksByCreatorId(creatorId);
+    }
+
+    @Override
+    public List<Task> listTasksByAssignee(Integer assigneeId) {
+        return taskMapper.findTasksByAssigneeId(assigneeId);
+    }
+
+    @Override
+    public List<Task> listTasksByStatus(TaskStatusEnum status) {
+        return taskMapper.findTasksByStatus(status);
+    }
+}
diff --git a/src/main/resources/mapper/TaskMapper.xml b/src/main/resources/mapper/TaskMapper.xml
new file mode 100644
index 0000000000000000000000000000000000000000..70c68263b317e06ddeb1611225513aefaee2f326
--- /dev/null
+++ b/src/main/resources/mapper/TaskMapper.xml
@@ -0,0 +1,106 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.example.newgroupshell.mapper.TaskMapper">
+
+    <sql id="Base_Column_List">
+        tid, title, description,create_time, update_time,start_time, deadline, assignee_id, creator_id, priority, status
+    </sql>
+    <!-- 插入任务 -->
+    <insert id="insertTask" useGeneratedKeys="true" keyProperty="tid"
+            parameterType="com.example.newgroupshell.pojo.Task">
+        INSERT INTO tasks
+        <trim prefix="(" suffix=")" suffixOverrides=",">
+            <if test="tid != null">tid,</if>
+            <if test="title != null">title,</if>
+            <if test="description != null">description,</if>
+            <if test="create_time != null">create_time,</if>
+            <if test="update_time != null">update_time,</if>
+            <if test="start_time != null">start_time,</if>
+            <if test="deadline != null">deadline,</if>
+            <if test="assignee_id != null">assignee_id,</if>
+            <if test="creator_id != null">creator_id,</if>
+            <if test="priority != null">priority,</if>
+            <if test="status != null">status,</if>
+        </trim>
+        <trim prefix="values (" suffix=")" suffixOverrides=",">
+            <if test="tid != null">#{tid},</if>
+            <if test="title != null">#{title},</if>
+            <if test="description != null">#{description},</if>
+            <if test="create_time != null">#{createdTime},</if>
+            <if test="update_time != null">#{updatedTime},</if>
+            <if test="start_time != null">#{startTime},</if>
+            <if test="deadline != null">#{deadline},</if>
+            <if test="assignee_id != null">#{assigneeId},</if>
+            <if test="creator_id != null">#{creatorId},</if>
+            <if test="priority != null">#{priority},</if>
+            <if test="status != null">#{status},</if>
+        </trim>
+    </insert>
+
+    <!-- 更新任务 -->
+    <update id="updateTaskById" parameterType="com.example.newgroupshell.pojo.Task">
+        UPDATE tasks
+        <set>
+            <if test="title != null">
+                title = #{title},
+            </if>
+            <if test="description != null">
+                description = #{description},
+            </if>
+            <if test="create_time != null">
+                create_time = #{createdTime},
+            </if>
+            <if test="update_time != null">
+                update_time = #{updatedTime},
+            </if>
+            <if test="start_time != null">
+                start_time = #{startTime},
+            </if>
+            <if test="deadline != null">
+                deadline = #{deadline},
+            </if>
+            <if test="assignee_id != null">
+                assignee_id = #{assigneeId},
+            </if>
+            <if test="creator_id != null">
+                creator_id = #{creatorId},
+            </if>
+            <if test="priority != null">
+                priority = #{priority},
+            </if>
+            <if test="status != null">
+                status = #{status},
+            </if>
+        </set>
+        WHERE tid = #{tid}
+    </update>
+
+    <!-- 删除任务 -->
+    <delete id="deleteTaskById">
+        DELETE
+        FROM tasks
+        WHERE tid = #{tid}
+    </delete>
+
+    <!-- 根据指派人ID查找任务 -->
+    <select id="findTasksByAssigneeId" resultType="com.example.newgroupshell.pojo.Task">
+        SELECT *
+        FROM tasks
+        WHERE assignee_id = #{assigneeId}
+    </select>
+
+    <!-- 根据创建者ID查找任务 -->
+    <select id="findTasksByCreatorId" resultType="com.example.newgroupshell.pojo.Task">
+        SELECT *
+        FROM tasks
+        WHERE creator_id = #{creatorId}
+    </select>
+
+    <!-- 根据状态查找任务 -->
+    <select id="findTasksByStatus" resultType="com.example.newgroupshell.pojo.Task">
+        SELECT *
+        FROM tasks
+        WHERE status = #{status}
+    </select>
+
+</mapper>