The model experiment of stratificated air conditioning in the powerhowse of Three Gorges Hydropower Station is briefly precented. On the basis of ensuring the effect of air conditioning, the influences of two types of outlet, three modes of air supply under the same outlet type on air distribution performance in occupied area was emphatically analyzed arrowd the measured data of occupied area's temperature and velocity in winter condition,and the best outtet type and air supply mode is obtained. By changing air supply temperature,its influence on the occupiod area's temperature is also analyzed,thus,some wecessary techincal data for follow enperiments and some condusions for reference have been draw.