diff --git a/business/jxutils/tasksch/task.go b/business/jxutils/tasksch/task.go
index 05bb49412..cf22e6af9 100644
--- a/business/jxutils/tasksch/task.go
+++ b/business/jxutils/tasksch/task.go
@@ -1,6 +1,7 @@
 package tasksch
 
 import (
+	"encoding/json"
 	"sync"
 	"time"
 
@@ -34,6 +35,9 @@ type ITask interface {
 	GetCreatedAt() time.Time
 
 	AddChild(task ITask)
+	GetChildren() TaskList
+
+	json.Marshaler
 }
 
 type BaseTask struct {
@@ -137,7 +141,8 @@ func (t *BaseTask) Cancel() {
 	}
 	t.locker.Unlock()
 
-	for _, subTask := range t.Children {
+	children := t.GetChildren()
+	for _, subTask := range children {
 		subTask.Cancel()
 	}
 }
@@ -178,6 +183,26 @@ func (t *BaseTask) AddChild(task ITask) {
 	t.Children = append(t.Children, task)
 }
 
+func (t *BaseTask) GetChildren() (children TaskList) {
+	t.locker.RLock()
+	defer t.locker.RUnlock()
+
+	if len(t.Children) > 0 {
+		children = make(TaskList, len(t.Children))
+		copy(children, t.Children)
+	}
+	return children
+}
+
+/////////
+
+func (t *BaseTask) MarshalJSON() ([]byte, error) {
+	type tBaseTask BaseTask
+	t.locker.RLock()
+	defer t.locker.RUnlock()
+	return utils.MustMarshal((*tBaseTask)(t)), nil
+}
+
 func (t *BaseTask) run(taskHandler func()) {
 	go func() {
 		taskHandler()
@@ -189,7 +214,6 @@ func (t *BaseTask) run(taskHandler func()) {
 	}()
 }
 
-/////////
 func (t *BaseTask) finishedOneJob(itemCount int, err error) {
 	t.locker.Lock()
 	defer t.locker.Unlock()