1From September 1997 to June 2006, 5438+0 studied in mechanical and electronic engineering major of Chang 'an University and obtained a bachelor's degree in engineering from Chang 'an University. From September 5438, 2006 to June 2004, he studied mechanical design and theory in Chang 'an University, or obtained a master's degree in engineering from Chang 'an University. From September 2004 to June 2007, he studied in the major of mechanical design and theory in Chang 'an University, and obtained a doctor's degree in engineering from Chang 'an University.