diff --git a/src/main/java/com/guo/learningprogresstracker/controller/reportFragmentsController.java b/src/main/java/com/guo/learningprogresstracker/controller/reportFragmentsController.java
index 7a0f0e7..c39c95e 100644
--- a/src/main/java/com/guo/learningprogresstracker/controller/reportFragmentsController.java
+++ b/src/main/java/com/guo/learningprogresstracker/controller/reportFragmentsController.java
@@ -1,16 +1,17 @@
 package com.guo.learningprogresstracker.controller;
 
 import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
 import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
 import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
 import com.guo.learningprogresstracker.service.impl.StudyReportFragmentsServiceImpl;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
 
 /**
  * 学习残片控制层
@@ -24,12 +25,29 @@ public class reportFragmentsController {
 
     /**
      * 创建学习残片
-     * @param request
-     * @return
      */
     @PostMapping
     public CommonResult<Void> createFragments(@Valid @RequestBody CreateFragmentsRequest request) throws NotFindEntitiesException {
         studyReportFragmentsServiceImpl.createFragments(request);
         return CommonResult.success();
     }
+
+    /**
+     * 更新学习残片
+     */
+    @PutMapping("/{id}")
+    public CommonResult<Void> updateFragments(@PathVariable Integer id,
+                                              @Valid @RequestBody UpdateFragmentsRequest request) throws NotFindEntitiesException {
+        studyReportFragmentsServiceImpl.updateFragments(id, request);
+        return CommonResult.success();
+    }
+
+    /**
+     * 获取指定会话的所有学习残片
+     */
+    @GetMapping("/session/{sessionNum}")
+    public CommonResult<List<StudyReportFragmentsEntity>> getFragmentsBySession(@PathVariable String sessionNum) {
+        List<StudyReportFragmentsEntity> fragments = studyReportFragmentsServiceImpl.getFragmentsBySession(sessionNum);
+        return CommonResult.success(fragments);
+    }
 }
diff --git a/src/main/java/com/guo/learningprogresstracker/dto/request/UpdateFragmentsRequest.java b/src/main/java/com/guo/learningprogresstracker/dto/request/UpdateFragmentsRequest.java
new file mode 100644
index 0000000..37acce3
--- /dev/null
+++ b/src/main/java/com/guo/learningprogresstracker/dto/request/UpdateFragmentsRequest.java
@@ -0,0 +1,16 @@
+package com.guo.learningprogresstracker.dto.request;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Data;
+
+/**
+ * @author guo
+ */
+@Data
+public class UpdateFragmentsRequest {
+    /**
+     * 残片内容,学习内容的描述
+     */
+    @NotBlank(message = "啊？无字天书？")
+    private String content;
+}
diff --git a/src/main/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvert.java b/src/main/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvert.java
index 896b723..ff4d89f 100644
--- a/src/main/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvert.java
+++ b/src/main/java/com/guo/learningprogresstracker/mapStruct/FragmentsConvert.java
@@ -1,6 +1,7 @@
 package com.guo.learningprogresstracker.mapStruct;
 
 import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
 import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
 import org.mapstruct.Mapper;
 import org.mapstruct.ReportingPolicy;
@@ -11,4 +12,6 @@ public interface FragmentsConvert {
     FragmentsConvert MAPPER = Mappers.getMapper(FragmentsConvert.class);
 
     StudyReportFragmentsEntity toFragmentsEntity(CreateFragmentsRequest request);
+
+    StudyReportFragmentsEntity toFragmentsEntity(UpdateFragmentsRequest request);
 }
diff --git a/src/main/java/com/guo/learningprogresstracker/service/StudyReportFragmentsService.java b/src/main/java/com/guo/learningprogresstracker/service/StudyReportFragmentsService.java
index 6e9b5f8..525385b 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/StudyReportFragmentsService.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/StudyReportFragmentsService.java
@@ -1,10 +1,13 @@
 package com.guo.learningprogresstracker.service;
 
 import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
 import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
 import com.baomidou.mybatisplus.extension.service.IService;
 import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
 
+import java.util.List;
+
 /**
 * @author guo
 * @description 针对表【study_report_fragments(记录学习过程中的学习内容报告残片)】的数据库操作Service
@@ -13,4 +16,8 @@ import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
 public interface StudyReportFragmentsService extends IService<StudyReportFragmentsEntity> {
 
     void createFragments(CreateFragmentsRequest request) throws NotFindEntitiesException;
+
+    void updateFragments(Integer id, UpdateFragmentsRequest request) throws NotFindEntitiesException;
+
+    List<StudyReportFragmentsEntity> getFragmentsBySession(String sessionNum);
 }
diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImpl.java b/src/main/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImpl.java
index fc64354..5e54fc0 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImpl.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/StudyReportFragmentsServiceImpl.java
@@ -3,6 +3,7 @@ package com.guo.learningprogresstracker.service.impl;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.guo.learningprogresstracker.dto.request.CreateFragmentsRequest;
+import com.guo.learningprogresstracker.dto.request.UpdateFragmentsRequest;
 import com.guo.learningprogresstracker.entity.StudyReportFragmentsEntity;
 import com.guo.learningprogresstracker.entity.StudySessionsEntity;
 import com.guo.learningprogresstracker.exception.NotFindEntitiesException;
@@ -13,6 +14,8 @@ import com.guo.learningprogresstracker.mapper.StudyReportFragmentsMapper;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+
 /**
  * 针对表【study_report_fragments(记录学习过程中的学习内容报告残片)】的数据库操作Service实现
  */
@@ -34,4 +37,23 @@ public class StudyReportFragmentsServiceImpl extends ServiceImpl<StudyReportFrag
         }
         this.save(entity);
     }
+
+    @Override
+    public void updateFragments(Integer id, UpdateFragmentsRequest request) throws NotFindEntitiesException {
+        StudyReportFragmentsEntity existing = this.getById(id);
+        if (existing == null) {
+            throw new NotFindEntitiesException(String.format("未能找到学习残片id[%d]", id));
+        }
+        StudyReportFragmentsEntity entity = FragmentsConvert.MAPPER.toFragmentsEntity(request);
+        entity.setId(id);
+        this.updateById(entity);
+    }
+
+    @Override
+    public List<StudyReportFragmentsEntity> getFragmentsBySession(String sessionNum) {
+        return this.list(
+                Wrappers.lambdaQuery(StudyReportFragmentsEntity.class)
+                        .eq(StudyReportFragmentsEntity::getSessionNum, sessionNum)
+                        .orderByAsc(StudyReportFragmentsEntity::getCreatedTime));
+    }
 }