In this paper, the photovoltaic grid power generation system is introduced in detail firstly, including the MATLABSIMULINK simulation of photovoltaic cells, and the analysis of its output characteristics. And then a scheme which is based on 1 MW photovoltaic grid power generation system, applies the collecting and distributing type inverter system to replace the traditional centralized inverter system and the set of string type inverter system is put forward. Multichannel MPPTs are adopting directly to track the maximum power point near the photovoltaic modules. And after direct current is boosted to 800 V, then is invertered centrakized into 520 V AC in the inverter rooms, and it is connected to the state grid finally. This system reduces the line loss during the DC/AC transmission and the inverters’loss, and improves the efficiency of the whole system.