The purpose of this study was to examing the effect of underwater encironment to human body. Heart rate is down under water, but it rised when water temperature is down. Body temperature rise under water, but it down when water temperature is down. In more cold water, eardrum and mouse temperature rise, but skin temperature is down . After exercise, eardrum and mouse temperature downed, but skin temperature rised, Blood pressure is down under water, but rised when water temperature is down.