Zhou Ying was born in 1978. She received her M.S. degree from Quill Normal University in 2003. She is currently a Ph.D. student in Research Institute of Automation, Southeast University. Her research interests are adaptive control and variable structure control. E-mail: autozhouy@ 163.com Wu Yuqiang was born in 1962. He received the Ph.D.degree in Automatic Control from Southeast University in 1994. Now, he is a professor, doctoral director at the Research Institute of Automation, Qufu Normal University. His research interests are adaptive control, variable structure control, switched system control and process control.