Abstract: For many years， more attention have been paid to the research and reutilization of phosphogypsum residues of phosphate fertilizer industry in China，but less attention to by-product-fluoridebearing silica gel.To avoid resources waste and environmental pollution，it is necessary to strengthen development and utilization of by-product silica gel.Provided，it could be effectively recovered and processed，considerable environmental and economic benefit will be gained.This paper summarized several comprehensive utilization techniques of by-product silica gel，including preparation techniques for liquid sodium silicate，white carbon，4A molecular sieve and sodium metasilicate pentahydrate from by-product silica gel in phosphate fertilizer industry.The property，application and market prospects of these products were introduced as well.Furthermore，the advantages and disadvantages of the techniques were summed up.