diff --git a/apps/opm/serializers.py b/apps/opm/serializers.py
index c5c618bc..ab886397 100644
--- a/apps/opm/serializers.py
+++ b/apps/opm/serializers.py
@@ -63,7 +63,7 @@ class OperationDetailSerializer(CustomModelSerializer):
     coordinator_ = UserSimpleSerializer(source='coordinator', read_only=True)
     create_by_ = UserSimpleSerializer(source='create_by', read_only=True)
     cates_ = OplCateSimpleSerializer(source='cates', read_only=True, many=True)
-    vchannels_ = TDeviceSimpleSerializer(source='vchannels', read_only=True)
+    vchannels_ = TDeviceSimpleSerializer(source='vchannels', read_only=True, many=True)
 
     class Meta:
         model = Operation