A schema of three level automatic voltage control system in distribution network with the connection of many distributed photovoltaic power plants is introduced. Through the analysis on the characteristics of distributed photovoltaic power station, the system structure, control mode, data communication, the design method of voltage control strategy is introduced in detail. The engineering examples show that, the design method of PV power station voltage control system of intelligent control technology based on partition is effective and practical. It can optimize the PCC voltage, power factor, and can make distributed photovoltaic power plant more friendly and efficient.