His research interests include visual servoing of dynamic systems, medical robotics, internet robotics, education robotics, multi-fingered grapsing, and active sensor networks. Prof. Liu has published over 100 papers in refereed professional journals and international conference proceedings. He received the 1994 and 1998 Best Journal Paper Awards from the Robotics Society of Japan, and the Best Paper Awards in the first and third IEEE Electro/Information Technology Conference. His students have received many best student papers award or nomination awards from the major international conferences in robotics and automation. The students supervised by him have become faculty members of universities in USA, Canada, Hong Kong and the mainland China.