The normal value of γ-glutamyl transpeptidase is 11~50U/L for men and 7~32U/L for women. 1400U/L is much more than the normal value, which is more serious and should be consulted in time. Gamma-glutamyl transpeptidase is an important indicator for judging hepatobiliary function. The normal value of gamma-glutamyl-3-carboxy-p-nitroaniline method is 11~50U/L for men, 7~32U/L for women, and 1400U/L is far above normal value, which is commonly found in biliary obstruction disease, acute and chronic viral hepatitis, cirrhosis, fatty liver and other diseases. Elevated gamma-glutamyl transpeptidase should be promptly consulted and treated under the guidance of a doctor, paying attention to diet and hygiene in daily life, quitting smoking and drinking, and paying attention to rest.