Hao Liu received the B.Eng. degree and M. Eng. degree in Mechanical Engineering from Central South University (CSU), China, in 1997 and 2000, respectively. And he received the Ph.D. in Mechatronic Control Engineering from Zhejiang University (ZJU), China, in 2004. From 2011 to 2012, he did collaborated research in the Tokyo Institute of Technology, Japan, as a visiting scholar. He is currently Associate Professor at State Key Laboratory of Fluid Power and Mechatronic Systems of ZJU. His research interests include exoskeleton robots, pneumatic servo control systems and airpower-fuel hybrid system.