Child’s grading standard is currently commonly used in clinical practice for quantitative assessment of liver reserve function in patients with cirrhosis, which was first proposed by Child, and generally consists of five indicators, namely, the presence or absence of hepatic encephalopathy, the presence or absence of ascites, the level of serum bilirubin, the concentration of serum albumin, and the duration of prothrombin. According to the different states of these five indicators, they are divided into three levels, which are recorded as 1, 2 and 3 points respectively, and the scores of these five indicators are summed up, with the lowest composite being 5 points and the highest being 15 points, so that according to the number of this composite, the liver functional reserve is divided into class A, B and C, which predicts these three different degrees of severity of liver damage, wherein the higher the scores are, the worse the functioning of the liver reserve is.Class A grade, B grade, and C grade predict good to bad liver function, respectively.