With the development of industry, fossil energy brings more pressures from pollution, most countries speed up the development and utilization of renewable energy, solar energy is more clean, harmless, widely applied, much more popular in recent years. Solar energy is the hot pint in renewable energy field, as the electric power lack gap get huge, human find solar solutions to supply the gap, and build on the rooftop of buildings, such as school, hospital, gymnasium, factory, office building etc.