According to statistics, the global installed capacity of photovoltaics increased from 37.04GW in 2014 to 102.00GW in 2017, with a compound growth rate of 40.2%. It is estimated that the global PV installation demand for 2018-2020 is 98.50, 117.20, and 139.90GW, respectively. It is assumed that the proportion of single crystal channels will be 40%, 50%, and 60% in the next three years, and the silicon consumption of monocrystalline silicon wafers will be 3.42 and 3.33, respectively. 3.22g/W, silicon wafer silicon consumption is 3.80, 3.56, 3.33g/W. According to this prediction, the total demand for silicon materials in 2018-2020 is about 35.93, 40.38, and 456,600 tons, respectively. Polysilicon is a form of elemental silicon. When molten elemental silicon solidifies under supercooled conditions, the silicon atoms are arranged in a diamond lattice form into a plurality of crystal nuclei. If the crystal nuclei grow into crystal grains with different crystal orientations, the crystal grains are combined and crystallized into polycrystalline silicon. . From the current development process of international solar cells, it can be seen that the development trend is monocrystalline silicon, polycrystalline silicon, ribbon silicon, thin film materials (including microcrystalline silicon-based films, compound-based films and dye films)