Abstract: Based on the meteorological data of 7 typical cities in different climate regions, the distribution of renewable energy in different climate regions was analyzed. Taking the two-story building as the reference building, the Energy Plus software was used to simulate and analyze the building energy consumption of seven typical cities, and the renewable energy system of buildings in different climate areas was designed.Based on the influence of standard quota subsidy and quota halving subsidy on the generation cost of renewable energy system, the optimal renewable energy system in different climate regions was obtained.The results show that the distribution of renewable energy and building energy consumption in different climate regions are quite different, so the building renewable energy system with wind and solar complementary power generation is designed. The halving of the amount of subsidy has little effect on the cost of renewable energy systems, and has no effect on the optimization of renewable energy systems. The most economical renewable energy system in Harbin is 2 kW photovoltaic module, 35 kW wind turbine and 6 kW inverter, and the power generation cost is 41 063 yuan/a, while that in Guangzhou is 6 kW photovoltaic module, 0 kW wind turbine and 2 kW inverter, and the power generation cost is 49 131 yuan/a.