diff --git a/modules/dispatch/model_dispatch.go b/modules/dispatch/model_dispatch.go
index 8ccbeead2..25c061eb7 100644
--- a/modules/dispatch/model_dispatch.go
+++ b/modules/dispatch/model_dispatch.go
@@ -175,7 +175,7 @@ func (this *modelDispatch) taskRandom(uid string, dispatch *pb.DBDispatch) (task
 			}
 		}
 		//追加随机
-		tasks = this.addRandomTask(uid, dispatch, randCount)
+		tasks = append(tasks, this.addRandomTask(uid, dispatch, randCount)...)
 	}
 
 	return
@@ -234,7 +234,7 @@ func (this *modelDispatch) replaceTask(uid string, taskId int32, dispatch *pb.DB
 		}
 	}
 
-	tasks = this.addRandomTask(uid, dispatch, randCount)
+	tasks = append(tasks, this.addRandomTask(uid, dispatch, randCount)...)
 
 	return
 }
@@ -256,7 +256,7 @@ func (this *modelDispatch) replaceFinishedTask(uid string, dispatch *pb.DBDispat
 		}
 	}
 
-	tasks = this.addRandomTask(uid, dispatch, randCount)
+	tasks = append(tasks, this.addRandomTask(uid, dispatch, randCount)...)
 	return
 }