The treatment plan of lung cancer after pleural metastasis needs to be formulated according to the extent of lung cancer metastasis. If the extent of lung cancer pleural metastasis is small and it is just a manifestation of local infiltration or local metastasis, it is treated in the same way as lung cancer and can be treated by surgery, targeted radiotherapy or the combination of surgery, chemotherapy and radiotherapy. If lung cancer has diffuse metastasis in the pleura and problems occur in the organ layers at the same time, this situation can only be solved by chemotherapy, immunotherapy or targeted therapy.