diff --git a/src/main/java/com/guo/learningprogresstracker/controller/TaskController.java b/src/main/java/com/guo/learningprogresstracker/controller/TaskController.java
index 7132fae..05ee47c 100644
--- a/src/main/java/com/guo/learningprogresstracker/controller/TaskController.java
+++ b/src/main/java/com/guo/learningprogresstracker/controller/TaskController.java
@@ -5,6 +5,7 @@ import com.guo.learningprogresstracker.common.Ops;
 import com.guo.learningprogresstracker.dto.response.StudySessionResponce;
 import com.guo.learningprogresstracker.entity.CommonResult;
 import com.guo.learningprogresstracker.dto.request.TaskRequest;
+import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
 import com.guo.learningprogresstracker.service.TasksService;
 import com.guo.learningprogresstracker.service.impl.StudySessionsServiceImpl;
 import io.swagger.v3.oas.annotations.Operation;
@@ -71,10 +72,10 @@ public class TaskController {
      * 开始或继续一个【学习会话】
      *
      */
-    @GetMapping("/{taskId}/studay-sessions/start-or-continue")
+    @GetMapping("/{taskNum}/studay-sessions/start-or-continue")
     public CommonResult startOrContinueStudySession(@NotEmpty(message = "taskId不可为空")
-                                          @PathVariable String taskId) {
-        StudySessionResponce responce = studySessionsServiceImpl.startOrContinueStudySession(taskId);
+                                          @PathVariable String taskNum) throws NotFindEntitiesException {
+        StudySessionResponce responce = studySessionsServiceImpl.startOrContinueStudySession(taskNum);
         return CommonResult.success(responce);
 
     }
diff --git a/src/main/java/com/guo/learningprogresstracker/entity/StudySessionsEntity.java b/src/main/java/com/guo/learningprogresstracker/entity/StudySessionsEntity.java
index b27afc2..c95fb8d 100644
--- a/src/main/java/com/guo/learningprogresstracker/entity/StudySessionsEntity.java
+++ b/src/main/java/com/guo/learningprogresstracker/entity/StudySessionsEntity.java
@@ -21,14 +21,17 @@ import java.time.LocalDateTime;
 @Data
 public class StudySessionsEntity extends BaseEntity implements Serializable {
 
-    @TableId(value = "session_id", type = IdType.AUTO)
-    private Integer sessionId;
+    @TableId(type = IdType.AUTO)
+    private Integer id;
+
+    @TableField(value = "session_num")
+    private String sessionNum;
 
     /**
      * 
      */
-    @TableField(value = "task_id")
-    private Integer taskId;
+    @TableField(value = "task_num")
+    private String taskNum;
 
     /**
      * 学习开始时间
diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/StudySessionsServiceImpl.java b/src/main/java/com/guo/learningprogresstracker/service/impl/StudySessionsServiceImpl.java
index 9c66de2..f8706df 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/StudySessionsServiceImpl.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/StudySessionsServiceImpl.java
@@ -4,11 +4,14 @@ import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.guo.learningprogresstracker.dto.response.StudySessionResponce;
 import com.guo.learningprogresstracker.entity.StudySessionsEntity;
+import com.guo.learningprogresstracker.entity.TaskEntity;
 import com.guo.learningprogresstracker.enums.StudySessionStateEnum;
 import com.guo.learningprogresstracker.exception.ErrorParameterException;
+import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
 import com.guo.learningprogresstracker.mapStruct.StudySessionConvert;
 import com.guo.learningprogresstracker.mapper.StudySessionsMapper;
 import com.guo.learningprogresstracker.service.StudySessionsService;
+import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
 import java.util.Optional;
@@ -19,18 +22,25 @@ import java.util.Optional;
 * @createDate 2024-06-09 15:28:48
 */
 @Service
+@RequiredArgsConstructor
 public class StudySessionsServiceImpl extends ServiceImpl<StudySessionsMapper, StudySessionsEntity>
     implements StudySessionsService{
 
-    public StudySessionResponce startOrContinueStudySession(String taskId) {
-        // 任务id下是否存在非”已结束“的学习会话
+    private final TasksServiceImpl tasksServiceImpl;
+
+    public StudySessionResponce startOrContinueStudySession(String taskNum) throws NotFindEntitiesException {
+        // taskNum是否存在
+        tasksServiceImpl.getOneOpt(Wrappers.lambdaQuery(TaskEntity.class).eq(TaskEntity::getTaskNum, taskNum))
+                .orElseThrow(() -> new NotFindEntitiesException(String.format("[%s]不存在",taskNum)));
+        // 任务taskNum下是否存在非"已结束"的学习会话
         Optional<StudySessionsEntity> oneOpt = this.getOneOpt(Wrappers.<StudySessionsEntity>lambdaQuery()
-                .eq(StudySessionsEntity::getTaskId, taskId)
+                .eq(StudySessionsEntity::getTaskNum, taskNum)
                 .ne(StudySessionsEntity::getSessionState, StudySessionStateEnum.ENDED.name()));
         // 有则返回该未完成会话，否则创建新的会话
         if (oneOpt.isEmpty()) {
             // 返回一个新的会话
             StudySessionsEntity studySessionsEntity = StudySessionsEntity.initNewSession();
+            studySessionsEntity.setTaskNum(taskNum);
             this.save(studySessionsEntity);
             return StudySessionConvert.MAPPER.toStudySessionResponce(studySessionsEntity);
         }else {