Liver cancer is one of the most common malignant tumors in China, with high malignancy and poor prognosis. Surgery, as the most effective and thorough treatment method, has been advocated by clinicians. However, surgery is more traumatic and the postoperative recovery is slower. Radiofrequency ablation is a new technology for liver cancer treatment that has emerged internationally in recent years. However, the old radiofrequency therapeutic instrument has many shortcomings and the therapeutic effect is not very satisfactory, and some even have serious complications. The main principle of radiofrequency ablation technology is that, when working, the electrode head sends out medium-high frequency radiofrequency waves to excite tissue cells to generate heat (temperature can be controlled from 60℃ to 100℃), so as to kill tumor cells quickly and effectively, and at the same time, it can make the vascular tissue around the tumor coagulate to form a reaction zone, so that it no longer supplies blood to the tumor, which is helpful to prevent tumor metastasis. The radiofrequency wave from the cluster electrode can cause coagulative necrosis of tissues (inactivated tumor area) up to 5cm×5.5cm×6cm at one time.