1.What is radiofrequency ablation? Radiofrequency ablation therapy is an effective method of local thermal therapy, and the multi-electrode radiofrequency ablation technology that has emerged in recent years is a newest radiofrequency needle method developed internationally, which is guided by B ultrasound or CT and controlled by electronic computer in terms of energy and time of radiofrequency emission to kill tumor lesions reliably and cause little damage to surrounding tissues. It is more reasonable and advanced than the previous treatments such as local “alcohol injection” and “freezing” for liver cancer. 2.What are the indications of radiofrequency ablation? Hepatocellular carcinoma of gastrointestinal, breast, lung and uterus with liver metastases, whose metastases are less than 5cm in diameter and less than 3 in number. 3.What are the contraindications of radiofrequency ablation? Patients with severe jaundice and ascites; severe liver and kidney function impairment; giant liver cancer or diffuse liver cancer.