With the rapid development of medical imaging, local treatment means such as image guided radiofrequency ablation are now more and more widely used in the treatment of liver cancer, and are among the three internationally recognized radical treatment means for small liver cancer, together with surgical resection and liver transplantation. Ultrasound-guided radiofrequency ablation is the most widely used. Its principle is to insert 1-2 radiofrequency ablation needles into the tumor center under the real-time guidance of ultrasound, and rely on the emitted radiofrequency waves to cause ionic shock and frictional heat generation in tumor cells, with the local temperature reaching 100℃, leading to coagulation and necrosis of tumor cells and occlusion of blood vessels around the tumor, blocking the blood supply to the tumor and inhibiting tumor growth and preventing metastasis. Ultrasound-guided radiofrequency ablation treatment for liver cancer has the following advantages: 1. accurate positioning, real-time monitoring, no radiological damage, easy operation and high safety. 2. Less traumatic, faster recovery, and can be repeated for many times, and the quality of life of patients is relatively high. Local ablation and surgical resection are the two “curative treatments” of liver cancer. Small hepatocellular carcinoma with good location can obtain the same therapeutic effect as surgical resection with local ablation. 4.Local ablation has lower requirements on patients’ general condition and local conditions of liver, which makes it more suitable for a wider range of people than surgical resection. At present, the technology of this treatment is relatively mature and easy to promote.