In general, liver function impairment caused by fatty liver takes about 3~6 months to recover, mainly related to the severity of fatty liver, and the recovery time of liver function will be prolonged for those with severe condition. Fatty liver is caused by excessive accumulation of fat in liver cells. Generally, the amount of fat deposition in liver within 33% is mild, between 33 and 67% is moderate, and more than 67% is severe, which is mainly related to obesity, hyperlipidemia, diabetes mellitus, and eating sweets and meat and other factors. 1. Mild fatty liver: patients do not have obvious symptoms, generally after dietary adjustment and appropriate exercise, liver function can be recovered in 1~3 months. 2. Moderate fatty liver: in this period, patients’ liver function will be easily damaged, and there will be pain in the liver area, etc. Generally, on the basis of light diet and proper exercise, and following the doctor’s instruction to use medication, such as simvastatin, etc., the liver function will return to normal in 3~6 months. 3. Severe fatty liver: this period may lead to necrosis of liver cells, and in serious cases, cirrhosis and other changes will occur, early treatment is necessary, such as controlling diet, active exercise, etc., and at the same time, medication such as glycyrrhizin or bisabolol can be given according to the doctor’s instructions, and it usually takes 6-9 months for liver function to recover, and it is irreversible for those who have developed into liver cirrhosis. The treatment of fatty liver needs to be carried out under the guidance of professional doctors to achieve the best therapeutic effect, do not blindly take medication on your own, so as not to aggravate the condition and prolong the recovery time of liver function, the specific recovery time can also be consulted with a professional physician.