Shuai Liguo, born in 1968. He received his M. S. degree and Ph. D degree in School of Instrument Science & Engineering of Southeast University in 1998 and 2001 ,respectively. He also received his B.S. degree from Xi'an JiaoTong University in 1991. His research interests include the intelligent robots, the technology of tactile display and the virtual reality technology.To whom correspondence should be addressed. E-mail: liguo, shuai@126.com