Objective To investigate the clinic effect and safety of modified whole lung lavage(m WLL) in the treatment of pneumoconiosis.Methods By random sample, 36 patients with stage II or III pneumoconiosis, had differential whole lung lavage(WLL). Using the patient's own left and right pulmonary matched control study. The treatment side lung(treatment group) using m WLL, which lavaged a total of 9 times, the positive pressure ventilation was performed at the end of 2, 4, 6, 8, 9 lavages after compound ammonium br...