At present, crystalline silicon materials (including polysilicon and monocrystalline silicon) are the most important photovoltaic materials, their market share in more than 90%%, and in the future for a long period of time is still the mainstream of solar cells. Polysilicon production technology for a long time in the United States, Japan, Germany and other 3 countries of 7 companies in the hands of 10 factories, forming technology blockade, market monopoly status. The demand for polysilicon is mainly from semiconductors and solar cells. According to the requirements of purity, divided into electronic and solar level. Among them, for electronic grade polysilicon accounted for about 55%%, solar-grade polysilicon accounted for 45%, with the rapid development of photovoltaic industry, solar cell demand for polysilicon growth faster than the development of semiconductor polysilicon, it is anticipated that 2008 solar polysilicon demand will exceed electronic grade polysilicon. The total production of solar cells worldwide 1994 was only 69MW, and 2004 was approaching 1200MW, which grew 17 times in just 10 years. Experts predict solar photovoltaic industry will surpass nuclear power as one of the most important basic energy sources in the first half of 21st century.