LI Zhen-Xing Ph.D. candidate in control theory and engineering at University of Science and Technology of China. He received his B. S. degree from Shandong University of Technology in 2010. His research interest covers nonlinear control and multiagent systems. Corresponding author of this paper. E-mail: zhxingli@gmail.com JI Hai-Bo Professor in the Department of Automation of University of Science and Technology of China. He received his Ph.D. degree in mechanical engineering from Beijing University in 1990. His research interest covers nonlinear control and adaptive control. E-mail: jihb@ustc.edu.cn