Abstract: The effects of calorie-restricted low-carbohydrate diets and dietary fiber interventions on liver function have been widely observed in recent years. Studies have found that calorie-restricted low-carbohydrate diets and high dietary fiber interventions have been shown to prevent and treat nonalcoholic fatty liver disease with positive effect. A calorie-restricted low-carbohydrate diet can effectively reduce the body weight,BMI,and hepatic fat lesions in patients with nonalcoholic fatty liver disease,effectively reducing AST levels,while there are controversy over TC,TG,HDL,and LDL findings for ALT and lipid metabolism-related indicators. High dietary fiber intervention can effectively reduce AST and ALT levels and improve liver function. The mechanism of calorie-restricted low-carbohydrate diets that improve liver function is to reduce energy intake,reduce insulin antagonism,and prevent fat accumulation. The mechanism by which dietary fiber improves liver function is to reduce the time of gastric emptying,reduce the permeability of the intestine,and increase the short-chain fatty acids that enhance the sensitivity of the liver to insulin,in order to regulate lipid metabolism and improve lipid metabolism and liver function. The paper reviewed the effects of calorie-restricted low-carbohydrate diets,dietary fiber interventions on body weight,BMI,liver function in patients with nonalcoholic fatty liver disease,and the mechanisms of improvement on liver function.