The liver is a “silent organ”, and liver cancer will only show symptoms such as weakness, poor nutrition and weight loss when it is almost at an advanced stage. The most important reason for the unsatisfactory outcome of liver cancer is late diagnosis. The key to improve the efficacy of liver cancer is early diagnosis! In recent years, the localization awareness of people with high incidence of liver cancer has increased significantly, and the combined application of liver cancer markers, ultrasound, CT, MRI and other means have made the early diagnosis of liver cancer possible. Practice shows that there is a “world of difference” between the efficacy of small liver cancer and middle and late stage liver cancer! If treated scientifically, the 5-year survival rate is over 50%, and many patients can survive for a long time. The increase in the number of patients with small hepatocellular carcinoma has to some extent influenced and changed the traditional principles of liver cancer treatment: one is liver transplantation, the huge cost of which is destined to benefit only a few patients. Another one is the minimally invasive local treatment represented by radiofrequency ablation, which is increasingly used in liver cancer clinics and has become one of the common means to treat small liver cancer with its advantages of definite efficacy, simple operation and moderate price. ”Radiofrequency ablation” is a liver cancer treatment technology developed only in recent years. Doctors only need to insert a needle-like probe into the patient’s tumor site under ultrasound guidance and radiate electric waves, which will generate heat when combined with cancer cells and cause the cancer cells to die, and the process of treating a small cancer tumor only takes 12 minutes. At present, the main indications of radiofrequency ablation for liver cancer are as follows: 1. The diameter of liver cancer is ≤5cm and there are less than 3 intrahepatic lesions. Research shows that for liver cancer with diameter ≤5cm, radiofrequency ablation can completely cure and replace surgery; 2. It is also the best choice for patients who do not want to undergo surgery, whose liver function does not allow surgery, and for those who have recurrence after surgery.