In order to solve the problem that the grid（unit） division of the conventional distribution network grid is relatively extensive

and the distribution network construction project cannot be reasonably selected when there is a certain investment quota constraint

this paper studies a grid optimization plan for distribution network method. Firstly

the paper constructs the current distribution network diagnostic analysis index system

grades the current distribution network

and compares with the first-class distribution network indicators to diagnose the weak links of the distribution network. Secondly

the paper studies the construction process of the distribution network target frame

determines the target frame and the transition frame according to the typical wiring pattern

the present situation question demand and the future development demand

and verifies the rationality of the target grid and the power supply grid（unit）. Finally

the paper researches project optimization calculation method to maximize the investment efficiency of the distribution network.