In order to achieve the tracking control of maximum power point for chemical photovoltaic system, and improve the transferring efficiency of solar energy, the fuzzy PID controller is applied in it. Firstly, the working theory of photovoltaic cell is analyzed. Secondly, the fuzzy PID controller of maximum power point of chemical photovoltaic system is designed. Finally, the controlling simulation of tracking control of maximum power point is carried out, and the results show that the fuzzy PID controller can get good controlling effect.