The reseacher of School of Earth and Space Sciences, the technical director of PKUGAC, the former curator of geology museum of Peking University, the deputy secretary general and vice chairman, the member of jewelry standardization committee of China, the member of CGC exam committee, the committee member of Gems & Jewelry Trades Association of China, recognized by CGC, GAC and GII, the editor of China Gems, China Gems and Jades, the consultant of many seminars, companies and colleges, the identification expert of CCTV 2.