From 65438 to 0992, he studied academic documents of pre-Qin, Qin and Han dynasties under Mr. Li Xueqin, specializing in unearthed bamboo slips and silks. 1994 was selected as a visiting scholar program of Harvard Yanjing Society, and studied as a postdoctoral graduate student in the anthropology department of Harvard University with Mr. Zhang Guangzhi. 1998 Peking University archaeological postdoctoral mobile station exits. 1999 Doctoral thesis "The Book of Changes, Silk and Ancient Learning" won the first national excellent doctoral thesis.