This paper mainly expounds a large complex low pressure tank in the development and the application in medical experiments. This composite low pressure tank can simulate the plateau low pressure, high temperature, low temperature, dry heat, strong ultraviolet radiation environment and so on. This tank can simulate a single climate conditions, and also can simulate various site of the composite climate environment through regulation. This tank provides experimental platform for the medical supports to the northwest troops,the firearm wounds treatment, drug related research with the extreme weather conditions and the accelerated plateau personnel acclimatization training, etc. This research results improve the medical experimental platform type.