The study designed and prepared certified reference material for pure silver purity with silver grade up to 99.994 %,in order to meet the detection of pure silver,silver and silver-containing products in the process of production and processing in China,and make them count in measurement traceability and quality control.The pure silver purity certified reference material is clean in surface and has homogeneous grain size.The material is cleansed and dried by ultrasound before being put in vacuum plastic bottle.The homogeneity and stability are both good according to test results.Glow discharge mass spectrometry,inductively coupled plasma emission spectrometry,inert gas melting-infrared thermal conductivity method,and combustion infrared method are used to determine the mass fraction of 77 impurity elements.After weight deduction,the silver grade is obtained.In the mean time,the silver grade is verified by atomic absorption spectrometry.The value is determined by several authority labs and proves to be accurate.The uncertainty degree is reasonably evaluated.