diff --git a/main.go b/main.go
index eef232f8..d383d906 100644
--- a/main.go
+++ b/main.go
@@ -131,7 +131,6 @@ func main() {
 			orm.RegisterSchemaWithIndexName(insight.Visualization{}, "visualization")
 			orm.RegisterSchemaWithIndexName(insight.Dashboard{}, "dashboard")
 			orm.RegisterSchemaWithIndexName(task1.Task{}, "task")
-			orm.RegisterSchemaWithIndexName(task1.Log{}, "task-log")
 			orm.RegisterSchemaWithIndexName(model.Layout{}, "layout")
 			orm.RegisterSchemaWithIndexName(model.Notification{}, "notification")
 			api.RegisterSchema()
diff --git a/plugin/migration/api.go b/plugin/migration/api.go
index e988ef76..e368b94e 100644
--- a/plugin/migration/api.go
+++ b/plugin/migration/api.go
@@ -81,7 +81,7 @@ func (h *APIHandler) createDataMigrationTask(w http.ResponseWriter, req *http.Re
 	clusterTaskConfig.Cluster.Target.Distribution = dstClusterCfg.Distribution
 	t := task2.Task{
 		Metadata: task2.Metadata{
-			Type: "pipeline",
+			Type: "cluster_migration",
 			Labels: util.MapStr{
 				"business_id":       "cluster_migration",
 				"source_cluster_id": clusterTaskConfig.Cluster.Source.Id,
@@ -912,48 +912,6 @@ func (h *APIHandler) countDocuments(w http.ResponseWriter, req *http.Request, ps
 	h.WriteJSON(w, countRes, http.StatusOK)
 }
 
-func (h *APIHandler) getMigrationTaskLog(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
-	id := ps.MustGetParameter("task_id")
-	query := util.MapStr{
-		"sort": []util.MapStr{
-			{
-				"timestamp": util.MapStr{
-					"order": "asc",
-				},
-			},
-		},
-		"query": util.MapStr{
-			"bool": util.MapStr{
-				"minimum_should_match": 1,
-				"should": []util.MapStr{
-					{
-						"term": util.MapStr{
-							"parent_id": util.MapStr{
-								"value": id,
-							},
-						},
-					}, {
-						"term": util.MapStr{
-							"id": util.MapStr{
-								"value": id,
-							},
-						},
-					},
-				},
-			},
-		},
-	}
-
-	q := &orm.Query{
-		RawQuery: util.MustToJSONBytes(query),
-	}
-	err, _ := orm.Search(task2.Log{}, q)
-	if err != nil {
-		h.WriteError(w, err.Error(), http.StatusInternalServerError)
-		log.Error(err)
-	}
-}
-
 func (h *APIHandler) updateDataMigrationTaskStatus(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
 	id := ps.MustGetParameter("task_id")
 
diff --git a/plugin/migration/pipeline.go b/plugin/migration/pipeline.go
index f7ccfccd..eae7ce8c 100644
--- a/plugin/migration/pipeline.go
+++ b/plugin/migration/pipeline.go
@@ -154,19 +154,10 @@ func (p *DispatcherProcessor) Process(ctx *pipeline.Context) error {
 				t.Status = task2.StatusError
 				tn := time.Now()
 				t.CompletedTime = &tn
-				p.saveTaskAndWriteLog(&t, &task2.Log{
-					ID:     util.GetUUID(),
-					TaskId: t.ID,
-					Status: task2.StatusError,
-					Type:   t.Metadata.Type,
-					Config: t.Config,
-					Result: &task2.LogResult{
-						Success: false,
-						Error:   err.Error(),
-					},
-					Message:   fmt.Sprintf("failed to handling task [%s]: [%v]", t.ID, err),
-					Timestamp: time.Now().UTC(),
-				}, "")
+				p.saveTaskAndWriteLog(&t, "", &task2.TaskResult{
+					Success: false,
+					Error:   err.Error(),
+				}, fmt.Sprintf("failed to handling task [%s]: [%v]", t.ID, err))
 			}
 		}
 		//es index refresh
@@ -225,21 +216,11 @@ func (p *DispatcherProcessor) handleReadyMajorTask(taskItem *task2.Task) error {
 	if err != nil {
 		return err
 	}
-	taskLog := &task2.Log{
-		ID:     util.GetUUID(),
-		TaskId: taskItem.ID,
-		Status: task2.StatusRunning,
-		Type:   taskItem.Metadata.Type,
-		Config: taskItem.Config,
-		Result: &task2.LogResult{
-			Success: true,
-		},
-		Message:   fmt.Sprintf("success to start task [%s]", taskItem.ID),
-		Timestamp: time.Now().UTC(),
-	}
 	taskItem.Status = task2.StatusRunning
 	p.sendMajorTaskNotification(taskItem)
-	p.saveTaskAndWriteLog(taskItem, taskLog, "")
+	p.saveTaskAndWriteLog(taskItem, "", &task2.TaskResult{
+		Success: true,
+	}, fmt.Sprintf("success to start task [%s]", taskItem.ID))
 	return nil
 }
 
@@ -272,15 +253,7 @@ func (p *DispatcherProcessor) handlePendingStopMajorTask(taskItem *task2.Task) e
 	if len(tasks) == 0 {
 		taskItem.Status = task2.StatusStopped
 		p.sendMajorTaskNotification(taskItem)
-		p.saveTaskAndWriteLog(taskItem, &task2.Log{
-			ID:        util.GetUUID(),
-			TaskId:    taskItem.ID,
-			Status:    task2.StatusStopped,
-			Type:      taskItem.Metadata.Type,
-			Config:    taskItem.Config,
-			Message:   fmt.Sprintf("task [%s] is stopped", taskItem.ID),
-			Timestamp: time.Now().UTC(),
-		}, "")
+		p.saveTaskAndWriteLog(taskItem, "", nil, fmt.Sprintf("task [%s] is stopped", taskItem.ID))
 	}
 	return nil
 }
@@ -295,15 +268,7 @@ func (p *DispatcherProcessor) handleRunningMajorTask(taskItem *task2.Task) error
 		tn := time.Now()
 		taskItem.CompletedTime = &tn
 		p.sendMajorTaskNotification(taskItem)
-		p.saveTaskAndWriteLog(taskItem, &task2.Log{
-			ID:        util.GetUUID(),
-			TaskId:    taskItem.ID,
-			Status:    taskItem.Status,
-			Type:      taskItem.Metadata.Type,
-			Config:    taskItem.Config,
-			Message:   fmt.Sprintf("task [%s] is complete", taskItem.ID),
-			Timestamp: time.Now().UTC(),
-		}, "")
+		p.saveTaskAndWriteLog(taskItem, "", nil, fmt.Sprintf("task [%s] is complete", taskItem.ID))
 	}
 	return nil
 }
@@ -355,19 +320,10 @@ func (p *DispatcherProcessor) handleRunningSubTask(taskItem *task2.Task) error {
 
 		tn := time.Now()
 		taskItem.CompletedTime = &tn
-		p.saveTaskAndWriteLog(taskItem, &task2.Log{
-			ID:     util.GetUUID(),
-			TaskId: taskItem.ID,
-			Status: taskItem.Status,
-			Type:   taskItem.Metadata.Type,
-			Config: taskItem.Config,
-			Result: &task2.LogResult{
-				Success: state.Error == "",
-				Error:   state.Error,
-			},
-			Message:   fmt.Sprintf("task [%s] is complete", taskItem.ID),
-			Timestamp: time.Now().UTC(),
-		}, "")
+		p.saveTaskAndWriteLog(taskItem, "", &task2.TaskResult{
+			Success: state.Error == "",
+			Error:   state.Error,
+		}, fmt.Sprintf("task [%s] is complete", taskItem.ID))
 	} else {
 		if state.RunningPhase == 1 && taskItem.Metadata.Labels["running_phase"] == float64(1) {
 			ptasks, err := p.getPipelineTasks(taskItem.ID)
@@ -400,7 +356,7 @@ func (p *DispatcherProcessor) handleRunningSubTask(taskItem *task2.Task) error {
 					taskItem.Metadata.Labels["running_phase"] = 2
 				}
 			}
-			p.saveTaskAndWriteLog(taskItem, nil, "wait_for")
+			p.saveTaskAndWriteLog(taskItem, "wait_for", nil, "")
 		}
 	}
 	return nil
@@ -519,15 +475,7 @@ MainLoop:
 			p.state[instanceID] = st
 		}
 	}
-	p.saveTaskAndWriteLog(taskItem, &task2.Log{
-		ID:        util.GetUUID(),
-		TaskId:    taskItem.ID,
-		Status:    task2.StatusStopped,
-		Type:      taskItem.Metadata.Type,
-		Config:    taskItem.Config,
-		Message:   fmt.Sprintf("task [%s] is stopped", taskItem.ID),
-		Timestamp: time.Now().UTC(),
-	}, "")
+	p.saveTaskAndWriteLog(taskItem, "", nil, fmt.Sprintf("task [%s] is stopped", taskItem.ID))
 	return nil
 }
 
@@ -779,19 +727,9 @@ func (p *DispatcherProcessor) handleReadySubTask(taskItem *task2.Task) error {
 	taskItem.Status = task2.StatusRunning
 	taskItem.StartTimeInMillis = time.Now().UnixMilli()
 
-	taskLog := &task2.Log{
-		ID:     util.GetUUID(),
-		TaskId: taskItem.ID,
-		Status: task2.StatusRunning,
-		Type:   taskItem.Metadata.Type,
-		Config: taskItem.Config,
-		Result: &task2.LogResult{
-			Success: true,
-		},
-		Message:   fmt.Sprintf("dispatch task [%s] to instance ", taskItem.ID),
-		Timestamp: time.Now().UTC(),
-	}
-	p.saveTaskAndWriteLog(taskItem, taskLog, "wait_for")
+	p.saveTaskAndWriteLog(taskItem, "wait_for", &task2.TaskResult{
+		Success: true,
+	}, fmt.Sprintf("dispatch task [%s] to instance ", taskItem.ID))
 	return nil
 }
 
@@ -903,32 +841,32 @@ func (p *DispatcherProcessor) getMigrationTasks(size int) ([]task2.Task, error)
 	return p.getTasks(queryDsl)
 }
 
-func (p *DispatcherProcessor) saveTaskAndWriteLog(taskItem *task2.Task, logItem *task2.Log, refresh string) {
+func (p *DispatcherProcessor) saveTaskAndWriteLog(taskItem *task2.Task, refresh string, taskResult *task2.TaskResult, message string) {
 	esClient := elastic.GetClient(p.config.Elasticsearch)
 	_, err := esClient.Index(p.config.IndexName, "", taskItem.ID, taskItem, refresh)
 	if err != nil {
 		log.Errorf("failed to update task, err: %v", err)
 	}
-	if logItem != nil {
+	if message != "" {
 		event.SaveLog(event.Event{
 			Metadata: event.EventMetadata{
-				Category: "migration",
+				Category: "task",
 				Name:     "logging",
 				Datatype: "event",
 				Labels: util.MapStr{
-					"task_id":        logItem.TaskId,
+					"task_type":      taskItem.Metadata.Type,
+					"task_id":        taskItem.ID,
 					"parent_task_id": taskItem.ParentId,
 					"retry_no":       taskItem.RetryTimes,
 				},
 			},
 			Fields: util.MapStr{
-				"migration": util.MapStr{
+				"task": util.MapStr{
 					"logging": util.MapStr{
-						"config":  logItem.Config,
-						"context": logItem.Context,
-						"status":  logItem.Status,
-						"message": logItem.Message,
-						"result":  logItem.Result,
+						"config":  util.MustToJSON(taskItem.Config),
+						"status":  taskItem.Status,
+						"message": message,
+						"result":  taskResult,
 					},
 				},
 			},
@@ -1046,7 +984,7 @@ func (p *DispatcherProcessor) splitMajorMigrationTask(taskItem *task2.Task) erro
 			Status:            task2.StatusReady,
 			StartTimeInMillis: time.Now().UnixMilli(),
 			Metadata: task2.Metadata{
-				Type: "pipeline",
+				Type: "index_migration",
 				Labels: util.MapStr{
 					"business_id":       "index_migration",
 					"source_cluster_id": clusterMigrationTask.Cluster.Source.Id,
@@ -1134,7 +1072,7 @@ func (p *DispatcherProcessor) splitMajorMigrationTask(taskItem *task2.Task) erro
 					Runnable:    true,
 					Status:      task2.StatusReady,
 					Metadata: task2.Metadata{
-						Type: "pipeline",
+						Type: "index_migration",
 						Labels: util.MapStr{
 							"business_id":       "index_migration",
 							"source_cluster_id": clusterMigrationTask.Cluster.Source.Id,