Abstract: Based on the measured power generation data of the modules at the outdoor demonstration platform in Wuwei,Gansu Province（which belongs to the cold and warm climate zone）,the power efficiency of the measured modules is calculated according to the module power efficiency model.The influence of module temperature and total environmental irradiance on energy efficiency of photovoltaic modules is studied by analyzing the calculation results of energy efficiency of photovoltaic modules under different environmental conditions.The results show that the energy efficiency of the modules decreases significantly with the increase of the module temperature,and increases significantly with the increase of the irradiance.However,in outdoor conditions,the influence of module temperature on component module energy efficiency is significantly greater than that of irradiation.