Nowadays, science technology has updated the human performance in hypertention water. Meanwhile, breath-hold is so common implied in hypertention water. Even though the protocol of breath-hold is so easy, yet, the results of it can change the physiological functions significantly. The aim of the experiment is to investigate the physiological reaction and performance of human beings. There were two males and six females facing immersion into O degreec C cold water. Moreover, there were two ways to immerse into the water: one is breath-hold face immersion and the other is breathing face immersion. Heart rate and blood pressure were measure throughout. In summer, it is so common for most people to do school diving at beach. If that is the case, people can know what the physical reaction and performance during in water, which is the gaurantee for them to have a save life in water.