Abstract: For the characteristic of high closing in compartment of high speed train, the ventilating design should ensure passengers' safety and comfort. Since the traditional method of temperature and velocity distribution depending on free jet experimental equations cannot consider the effects of push pull flow and obstacle, the ventilating design mainly depends on modeling experiment. By regarding the push-pull flow and the shape of compartment and the seats as a integer, the research method in this paper directly simulate temperature and velocity distribution to ensure the demanding of comfortable air conditioner and conveniently obtain feeding velocity and feeding temperature difference. This method is not only applied in ventilating design of high speed train but also applied in ventilating design of general manned train and of aircraft's cabin.