diff --git a/apps/mtm/serializers.py b/apps/mtm/serializers.py
index 0355ff2a..86e6039a 100644
--- a/apps/mtm/serializers.py
+++ b/apps/mtm/serializers.py
@@ -254,7 +254,7 @@ class RouteSerializer(CustomModelSerializer):
                     material_out.process = process
                     if material_out_tracking != material_out.tracking:
                         raise ParseError("物料跟踪类型不一致!请前往物料处修改")
-                    if instance.material:
+                    if material_out.parent is None and instance.material:
                         material_out.parent = instance.material
                     material_out.save()
                 # elif material_out.process != process:
@@ -285,7 +285,7 @@ class RouteSerializer(CustomModelSerializer):
                     material_out.process = process
                     if material_out_tracking != material_out.tracking:
                         raise ParseError("物料跟踪类型不一致!请前往物料处修改")
-                    if instance.material:
+                    if material_out.parent is None and instance.material:
                         material_out.parent = instance.material
                     material_out.save()
                 # elif material_out.process != process: