Drinking a small amount of water will not have much effect on the liver function test results, but drinking a lot of water in a short period of time will dilute the blood and thus affect the liver function test results, so before the liver function test, in addition to the night before to fast, try not to drink water, really thirsty can drink a small amount. In addition, a few days before the liver function test, we should also pay attention to balanced nutrition, diet should be light, it is best not to eat high-fat, greasy, indigestible food, do not smoke, do not drink, try not to take drugs, do not stay up late, pay attention to rest, work and rest, avoid strain, do not do strenuous exercise, mood to keep happy, so that the test results will not be deviated.