Most primary lung cancers are accompanied by intrapulmonary metastasis, and the treatment mainly focuses on the treatment of primary lesions, treatment of metastatic foci and symptomatic supportive therapy. 1. Treatment of primary lesions: for small cell lung cancer, chemotherapy or radiotherapy is preferred. For non-small cell lung cancer, genetic testing should be carried out in time, and according to the results of genetic testing, targeted therapy, therapy to inhibit vascular endothelial growth, immunotherapy, etc. should be given. 2. Treatment of metastatic foci: If the metastatic foci are ipsilateral and small, surgery or local ablation can be performed. For diffuse multiple metastases in both lungs, chemotherapy, targeted therapy, vascular endothelial growth inhibition therapy and immunotherapy can be given. 3. Symptomatic supportive treatment: after lung cancer metastasis occurs, the patient will have dry cough, which is most obvious at night, accompanied by dyspnea. For this kind of patients, cough suppressant can be given as symptomatic treatment. Patients with respiratory difficulties can be given oxygen, and if necessary, can also be given ventilator-assisted ventilation. It is recommended that patients seek timely medical treatment, active treatment, and maintain a good state of mind in order to prolong the survival period.