Dr.Liu is the director of ITS department of CUSTReC of CATS, also the vice director of the Key Lab. on APTS of MOT, and his major research area mainly focus on Advanced Public Transportation System(APTS), Mobility as a Service(MaaS) and Urban Sustainable Transport Policy Study. As the team leader, he has drafted the Guideline on APTS of China issued by MOT, and also drafted 11 technical specifications on APTS issued by MOT. He is currently responsible for developing on China National Transit Database (CNTD) for MOT. Dr. Liu has published more than 40 scientific papers on ITS and APTS, and published the book of “APTS Research and Practice” as the editor-in-chief in 2015.