PV has significant energy, environmental and economic benefits, is one of the best green energy, install one kilowatt photovoltaic system at China's average sunlight conditions, 1 kWh of electricity in 1200 may be issued, to reduce coal (coal) use about 400 kg, to reduce carbon dioxide emissions by about one ton, according to the World Wildlife Fund (WWF) results: from reducing carbon dioxide effect, installing photovoltaic systems is equivalent to 1 square meter afforestation 100 square meters, the development of solar power and other renewable energy is one of the effective means to solve the haze, acid rain and other environmental problems radically.