Hu Haiyan, born in 1983. He received his B.S. and M.S. degrees from Harbin University of Science and Technology in 2004 and 2007 respectively. Now he is a Ph. D. candidate in Robotics Institute, Harbin Institute of Technology. His research interests include medical robot and bionic robot.To whom correspondence should be addressed. E-mail: huhyhit@Gmail.com