Abstract: Shihu gold deposit in Hebei Province, belonging to pyrite sulfide type,is characterized by multistage mineralization,but the main stage of mineralization is almost coincident with the mass separation of sulfide.The sulfur in sulfide and mineralizing hydrothermal solution is derived from anatectic granitic magma.The occurrence mechanism of gold is discussed on the basis of micro-texture and crystallography.The fact that the fineness of gold in the deposit is low suggests that the development degree of sulfide has in fluenced the fineness of gold.The gold is enriched in large amounts only in the later stage of mineralization.