Liver cancer is asymptomatic in the early and middle stages, so physical examination by screening is especially important. People with the following high-risk factors are especially alert. Family history of liver cancer, frequent alcohol consumption, diabetes, hepatitis B and C infection, and having the basis of cirrhosis. The above-mentioned people should have a physical examination every 4-6 months after the age of 40. This includes fetal protein and ultrasound. Because color ultrasound requires high operator requirements, some small liver cancers are difficult to identify by color ultrasound. If you feel your local hospital level is limited, you can directly do enhanced CT which is more sensitive. Many patients ask which one is clearer, MRI or CT. This depends on the physician, equipment and experience of the hospital. It is better to follow your local doctor’s opinion. The general population needs to avoid drinking large amounts of alcohol, avoid eating moldy peanuts. At present, many spoiled peanuts made into small packages of fried peanuts, so try to reduce the consumption of peanuts in bags. Know the quality of local drinking water. Avoid contamination of water sources by toxic substances. Exercise properly to reduce fatty liver; rest reasonably, immune enhancement, and active treatment of liver disease. All need to pay attention. Elevated alpha fetoprotein, many people ask whether elevated is all liver cancer, the answer is no. Elevated alpha fetus represents liver recovery growth. It is also high when a child is born. It is good to have elevated alpha fetus after primary liver damage. However, if it is persistently higher than 150 U/L, you need to use enhanced CT to determine if there is something growing on the liver. If there is no abnormality, simple elevation will need to be reviewed periodically. The transformation from normal liver tissue to liver cancer needs a process to go through precancerous lesions, so an enhanced MRI every six months for cirrhotic patients is able to detect many early states of liver cancer.