The recurrence rate of liver cancer after ablative radiofrequency surgery depends on the size of liver cancer; for example, the recurrence rate of small liver cancer with diameter <3cm is 30%-45% at three years and 60%-70% at five years. At present, surgery is still an important treatment for liver cancer, but in clinical practice, 90% of patients have already lost the chance of surgical treatment at the first diagnosis, and mid- to late-stage liver cancer cannot be completely removed by surgery. In terms of treatment, targeted therapy, systemic chemotherapy, radiotherapy and local treatment are mainly used, among which local treatment includes transhepatic artery interventional chemoembolization, radiofrequency ablation treatment, and anhydrous alcohol local injection treatment. Radiofrequency ablation treatment for liver cancer is mainly a means to kill cancer cells by using high-frequency current to generate heat, because cancer cells have low heat resistance, using the thermal effect of high-end current, the temperature at the front end of radiofrequency needle can reach 70-100℃, thus can kill tumor cells.