1.2013.10-2013.12 Visiting scholar at Yale University, USA.

2.20 10.8-20 10.9 visiting scholar at Leiden university in the Netherlands. 3. From July 2003 to July 2004, he was a visiting scholar at the University of Illinois at Urbana-Champaign. 4. August 2002-2002.10 Visiting Scholar of The Chinese University of Hong Kong. 5.1999.8-1999438+00 Visiting Scholar, University of Hawaii, USA. 6. 1996.8- 1997.7 Visiting scholar, Kent State University, Ohio.