40 cases of primary lung cancer with metastatic pleural effusion were treated by both of bronchial arterial infusion(BAI)of anticancer drugs and intrapleural in- jection of CDDP after drainage.The result of the studies showed as follows:The complete remission(CR)in 10,partial remission(PR)in 12,thus the response rate(CR+PR)was 75%(30/40).This method can prolong survival period,relieve pain,raise life qualities. Therefore a valuable palliative therapy.