In view of the limitations of automated mechanical transmission (AMT) for plug-in hybrid electric vehicle (PHEV), as a scheme of new transmission system without synchronizer Electric-drive Automated Mechanical Transmission (EMT) was proposed. Taking use of the electric machines’ speed quick response characteristic, EMT uses active synchronous gearshift instead of the passive friction gearshift in AMT. To optimize the gearshift quality in PHEV, the gearshift control strategies in which engine、motor and clutch are coordinative controlled. Then validate the control strategies by simulation and real bus tests, the results reveal that the proposed control strategies can noticeably improve the gearshift quality of PHEV equipped with EMT.