2004-2006 department of mechanical engineering, Johns Hopkins University, USA, postdoctoral fellow.

2006-2008 postdoctoral fellow, Department of Biology and Agriculture, University of California, Davis.

2008-20 1 1 Researcher Oppenheimer, Los Alamos National Laboratory, USA

2007-20 12 Visiting scientist, part-time job, Johns Hopkins University, USA.

20 1 1- Professor, Department of Engineering Mechanics, Tsinghua University University of Aeronautics and Astronautics.