Suitable indications: 1, there are contraindications to surgery, such as advanced age, serious cardiopulmonary disease, etc. 2, unilateral or bilateral metastatic lung cancer, in principle, no more than 3 per side, and no more than 6 in total; 3, the patient himself refuses surgical treatment, radiofrequency ablation can be chosen; 4, lung cancer with distant metastases, but the metastases are not extensive, there is no malignant mass, the patient is in good condition or the metastases can also be treated by radiofrequency ablation, at this time if If patients agree to active treatment, radiofrequency ablation can be used to treat lung or other metastases, together with systemic chemotherapy to achieve comprehensive treatment. Radiofrequency ablation is a treatment method designed according to the characteristics of poor heat dissipation of tumor and heat sensitivity of cancer cells, which makes the temperature of tumor tissue higher than its adjacent normal tissue, and high heat can kill cancer cells without side effects. It is more suitable for those who are too old or weak to undergo surgery, and has been gaining more and more attention in anti-tumor treatment in recent years.