A method of supplying oxygenated water is performed on a water tank, in which oxygenated water is received. The method lets the water tank supply a constant amount of the oxygenated water once, and then supply the water tank with water and pure oxygen to recover the dissolution ratio of oxygen of the oxygenated water in the water tank. The method may supply a constant amount of oxygenated water every time for the user to drink it up once.一種溶氧水之給水方法,係利用控制一槽體內的空間維持在高壓狀態,以及有效設定一出水口的啟閉時間與定量出水,同時配合進水的補充作業,以確保每次取飲溶氧水的含氧量維持在一定比例,以達取飲效果事半功倍之效。