Once the metastasis of melanoma occurs, it means that the disease has entered advanced stage and can only be treated by chemotherapy and immunotherapy to control the tumor progression as much as possible and prolong the survival time of patients. According to statistical data, most patients with double lung metastases have a survival time of 8-10 months. Molecular targeted therapy can control the progression of the disease in both lungs and prolong the survival time, but the specific survival time cannot be predicted and needs to be analyzed on a case-by-case basis.