Radiofrequency ablation (RFA) is a truly new, minimally invasive, physically targeted method of tumor treatment. The principle of RFA technology: It is guided by imaging (CT, B ultrasound, etc.) and uses radiofrequency thermal effect (the temperature of the center of the treated tumor can reach 90℃-100℃) to cause coagulative necrosis of tissues and achieve the purpose of tumor removal. Indications: For primary solid tumors (liver, lung, kidney, spleen and other malignant tumors), patients who cannot tolerate or refuse surgical treatment; double lung (liver) metastases (total number of less than 5); radiotherapy and chemotherapy are not effective and need comprehensive treatment, RFA can be used for treatment. RFA is considered as an effective local treatment method because of its safety, minimally invasive, short treatment time and good repeatability. It can further improve the therapeutic effect of tumors when combined with other methods of treatment, which is obviously a considerable achievement compared with chemotherapy and radiotherapy, and it is a very promising minimally invasive treatment with few comorbidities and high quality of life of patients after surgery.