With the rapid development of photovoltaic technology, building photovoltaic applications has become one of the hotspots. Based on the characteristics of the building photovoltaic power generation, the paper established model of light radiation received in accordance with the theory of light radiation, the radiation values to obtain the total panels in different regions, different orientations received. Secondly, according to the light irradiation was used as an input to establish a photovoltaic power generation project application model. Finally, gives PV power control strategy, and established the power and reactive power control mode of photovoltaic power generation model.