Objective To investgate the CT scan features of tracheobronchial amyloidosis in order to improve the diagnosis.Methods CT imagings of 7 patients(5 males and 2 females, mean age 48,range from 32~69 years.)with tracheobronchial amyloidosis histopathologically confirmed retrospectively analyzed.7 patients performed CT scan of thorax.Results 7 patients were diffuse lesions in tracheobronchial tree with wall thickening and lumen stenosis unequally.3/7 manifest annular wallthickening,4/7 manifest nonuniform wallthickening, 2/4 involve the front wall distinctly,1/4 involves the right wall distinctly,1/4 involves the front and two sides of the walls distinctly.4/7 involve two sides of the main bronchuses.1/7 involve the upper left lobe bronchus.1/7 involve the main bronchuses and all branches.1/7 uninvolved.2/7 find a soft tissue nodule against to the wall respectively.2/7 accompanied by applications,such as pulmonary atelectasis,diffuse bronchiectasia.7 patients performed histopathological examinations result of amyloidosis. conclusion tracheobronchial amyloidosis has certain characteristic on CT scan,this examination can help find applications of the lung,and plays a guidance role in diagnosis and treatment.