Hydration therapy usually refers to a kind of treatment and method to reduce liver and kidney toxicity by giving a large amount of rehydration fluids when applying some special drugs, because the large amount of rehydration fluids will reduce the damage and side effects of the drugs to the body. The purpose of hydration therapy is to increase renal blood flow, so weakening renal vasoconstriction, shortening the half-life of the drug in the plasma concentration, so it can accelerate the excretion of toxic drugs, and hydration therapy can increase the glomerular filtration rate, reducing the retention of toxic drugs in the kidneys and the time of retention. In addition, the way of hydration includes intravenous rehydration and oral rehydration, intravenous rehydration of hydration therapy can be applied to 0.9% saline and 5% glucose syrup, food rehydration can include daily drinking water, mineral water, fruit juice, etc., the amount of hydration fluid should be calculated according to the patient’s kilograms of body weight and the amount of water needed every day, not too much hydration fluid, and not too little hydration fluid.