Aiming at the problem of the maximum power point of photovoltaic cell occuring shift with the change of environmental condition,builds the equivalent model of photovoltaic cell,adopts PVsyst software to simulate the output performance of photovoltaic cell under different illumination and temperature, based on conductance increment method using Matlab/Simulink software to establish maximum power point tracking(MPPT) simulation model. The simulation result shows that MPPT control method based on conductance increment method can fleetly realize MPPT of photovoltaic power generation system under the change of environment and load,and the precision of the stability is high.