China national emission standard stage V has been a big issue for development of vehicle system,especially for the ve-hicles with direct injection and turbo chargerd engines as well as wet type DCT transmission because the particulate and the clutch pres-sure influence the emission results.This paper investigates the key issues of emission development based on the characters of such vehi-cles on the topics of control strategy of engine and transmission control system and after-treatment design.Through the deep analysis of the log files and control parameter improvement good results of less than 70%of limit consideringthe deterioration factor have been ob-tained and development target is perfectly achieved.