This paper analyzes the electrical characteristics and power generation principles of solar cells, and researches the solar
grid inverters and inverter control technology. Based on the study of grid-connected inverter, the inverter system joins PI feedback control algorithm, and gets the PI feedback control structure and its transfer function. Finally, the inverter circuit which has joined the PI feedback control algorithm is simulated by MA TLAB. From the results of simulation can be seen that the system with PI feedback control can get stable output current, and improve the state performance of the system.