Abstract: Objective To discuss the value of 16 slice spiral CT detecting tracheobronchial tumors.Methods Twenty-eight cases with suspected tracheobronchial principalis tumors undertook GE Light speed16 CT scan.The original data were processed and reconstructed at AW4.2 workstation.The images of trachea and bronchial tumors were reviewed and compared with pathologic results after operation.Results Out of the 28 cases with tracheobronchus principalis tumors,the CT detected 16 with trachea tumors and 12 with bronchial tumors(6 on the fight and 6 on the left).Among them,23 were squamous carcinoma with 2adenocarcinoma,1 leiomyoma,1 adenoma and 1 adenoid cystic carcinoma,which were consistent with pathologic results after operation.Conclusion The 16 slice spiral CT scan combining reconstruction techniques can detect the location of the tracheobronchial tumors and make qualitation and quantitation diagnosis,which is an accurate and noninvasive diagnosis method.It is important in clinical diagnosis.