Objective: To approach the fiberobronchoscopic characteristics of malignant atelectasis.Methods: Retrospective analysis of the clinical data and fiberobronchoscopic findings of 71 patients with malignant atelectasis was made.Results: Atelectasis occurred in the right lung more than in the left with the ratio of 1.6 to 1

and in the upper lobe more than in the lower lobe with the ratio of 2.29 to 1.The direct fiberobronchoscopic features of lung cancer were present in all patients.Tubular masses were seen in most cases(43 cases

76.06%).Among the 71 cases there were 43 cases of squamous carcinoma(60.56%) which was of the pathological category.And the morphological features in fiberobronchoscopic findings were closely related to the pathological categories of lung cancers.Conclusion: Patients with atelectasis discovered by means of X-rays should be examined with fiberobronchoscopy as early as possible for final diagnosis.