The quartz glass produced with synthetic silica is called synthetic quartz glass; Mainly used in the production of optical components, semiconductors optical fiber. The purity of natural silica is generally more than 4 9 (99.99%); The purity of synthetic quartz glass can exceed 6 nines (99.9999%). The hydroxyl content of synthetic quartz glass produced by direct decomposition of silicon tetrachloride by hydrogen oxygen flame is about 2000ppm, which is generally used for optical quartz glass. Because the optical fiber is allowed to have hydroxyl, so first in hydrogen oxygen flame plasma flame thermal decomposition SiCl4 SiHCl3, the production of smoke like SiO2, further in the electric furnace dehydroxyl, melting into transparent quartz rod, pulled into optical fiber. It is a new method to synthesize SiCl4 SiHCl3 into quartz crystal then melt it into quartz glass.