The basic principle of the vacuum wave are as followers: Use vacuum pump to pump away the air from the closed chamber, then water will enter into the chamber. When the water level up to about 4.5 meters, suddenly open the exhaust valve, then the water in the chamber fall down quickly and form big waves in the pool. The waves can reach 2.5 meters high, so players are requested to wear life jackets. It is a new project in water park.