Solar energy, generally refers to the sun's radiant energy, nowadays generally used in power generation.Since the formation of organisms on Earth, organisms live on the sun to provide the heat and light, and human also knows how to dry things by sunlight since ancient times. and as a way to preserve food such as salted fish and other salt by the sun. However, not until the reduction in fossil fuel, human has intention to further develop solar energy. Solar energy use in two ways, a passive use of solar thermal and photoelectric conversion. Solar power is a new kind of  renewable energy. In a broad sense, solar energy is the source of a lot of energy on earth, such as wind energy, chemical energy, water potential, and so on.