On the basis of an engineering project of mid-voltage distribution network operation risk assessment in a south city, for the purpose of improving the reliability of power supply for the urban network, a decision scheme of whether the loop closing operation for urban mid-voltage distribution network can be executed during overhauling the line or transformer is presented. This paper shows a schematic diagram of loop closing operation and accordingly analyzes loop closing operation in urban mid-voltage distribution network, clarifies the ultimate goal of looping closing is for the point that with a load transfer after loop opening system and then puts forward a decision scheme to judge whether can execute loop closing operation, construction reasons of can not execute loop closing operation, interprets the principle of excessive posterior loop current, and gives countermeasures to create beneficial conditions to loop closing operation. The analyses of examples show that the decision scheme is correct and effective.