In order to meet the need of reference materials for arsenic content analysis in gold ores and concentrates and ensure the accuracy of analysis data,2 reference materials were developed for arsenic content analysis for gold ores,3 for gold concentrates,and the arsenic grade is 0.14 %-5.46 %.The paper introduced the preparation of reference materials and the test for their uniformity and stability.Verified by many laboratories valuing with potassium bichromate method and ICP-AES,the data are accurate and reliable and can be used as important reference for measuring dissemination of value of quantity and measurement traceability.This series of reference materials are reasonable in design,steep in gradient,and applicable,bearing industrial and social significances.