Nowadays, the sea transportation is becoming more and more popular with its cheap and large capacity transport characteristics. At the same time, the ship hull rinsing is also gradually becoming higher demand in the ship transportation sector, during the transportation in the sea, there will be plenty of sea stars, reefs and other type of sea creatures will attach on the ship hull so that it will cause the ship structure damage. To resolve this issue, the ship hull rinsing can deal this particular problem. This article will investigate and analyze the water squirt pipe flow velocity to reveal what range of velocity is the best way to rinse the hull effectively without damage its structure.