Abstract: At present, there are still a large number of non automatic equipment in the distribution network of Gaochun District, Nanjing. This directly causes the power supply dispatching and line operators to be unable to correctly control the non automatic switch status of the distribution network. With the development of the distribution network and the complexity of the grid, in order to ensure the safe operation of the power grid, the state of the distribution network equipment must be lean managed by management means. Now in the distribution network D5200 system, the single line diagram of the distribution network in Gaochun district has been applied. It brings great convenience to the arrangement of operation mode and the dispatching of shutdown and resumption of service. However, the non automatic switch of distribution network shall be manually set after operation. There is a risk that the switch status of the distribution network diagram is wrong. Therefore, it is very important to improve the correctness of the position and state of the distribution network switch for the correct arrangement of the operation mode and the correct operation of the distribution network.