Abstract: In this paper,142 pulmonary carcinoma cases with positive pathological,brush biopsy and sputum exfloliztive cytologic examinations were studied,in which 62 were squamous carcinoma,18 were adenocarcinoma and 59 were undifferentiatied small cell carcinoma.Based on the pathological typing criteria,contrast analyses were conducted according to such factors as the results of the brush biopsy examination,the arrangement consitions fo the same type carinomatous cells,the cytoplasm chromoto-philic conditions,the size of the cell,the teratogenesis of the nucleus and chromatinic structure during microscopy of sputum specimens.In oredr to investigate the morphologic characteritics of the carcinomatous cells during brush biopsy.