Radiofrequency ablation is a fast-developing thermal ablation technique for tumor treatment in the past decade or so, which is an ultrasound-guided interventional treatment for liver cancer. It has the advantages common to thermal ablation techniques, such as easy operation, small trauma, repeatability and complete local necrosis. After local anesthesia on the body surface, radiofrequency electrode needle is used to enter the liver tumor percutaneously to start microwave heating, which directly burns the tumor in situ and the necrotic tumor can be absorbed gradually. 1.For patients with single tumor ≤5cm in diameter or multiple nodules within 3 nodes with maximum diameter ≤3cm, no vascular or bile duct invasion or distant metastasis, early liver cancer treatment patients with liver function Child grade A or B, microwave ablation (or radiofrequency) is the best choice other than surgical operation. For small hepatocellular carcinoma with single tumor diameter ≤3cm, radical ablation can be achieved. treatment. 5.The distance of the tumor from the total hepatic duct in the hilar region and the left and right hepatic ducts is at least 5 mm. 6.For tumors adjacent to the heart, diaphragm and gastrointestinal duct region, microwave ablation combined with anhydrous alcohol injection can be used; 7.For multiple lesions or tumors >5 cm, according to the patient’s liver function status, the method of hepatic artery chemoembolization (TACE or TAE) followed by microwave ablation can be adopted; 8.For liver metastatic cancer, no matter single or multiple tumors It needs to be combined with systemic chemotherapy or endocrine therapy (for endocrine-dependent tumors such as prostate cancer or breast cancer), etc., and attention should always be paid to the situation of the primary foci. 9.For those patients with large and multiple tumors that cannot be treated surgically and other methods such as hepatic artery chemoembolization have no obvious effect. The purpose of treatment is to reduce the tumor load to slow down the disease, reduce pain and prolong life.