Objective：To study and to summarize the clinical feature，imaging feature，key points for diagnosis and differential diagnosis of bronchioloalveolar carcinoma（BAC） so as to improve the clinicians’ understanding，diagnosis and treatment of BAC. Methods：Clinical data of 32 patients with BAC in the department of respiratory and department of thoracic surgery in our hospital from May 2010 to September 2013 were studied retrospectively，including clinical manifestation，thoracic image，laboratory test and pathological examination，etc. Results：Clinical features of BAC were cough，expectoration，blood in sputum，progressive dyspnea；a lot of white frothy sputum was the remarkable characteristic of BAC，but not the common performance. The imaging of BAC was of 3 types：solitary nodular type，pneumonia type and diffusing type，each type had its typical imaging findings. Thirty-two patients were diagnosed as BAC by pathological or cytological examination. Conclusions：Mastering the clinical feature，imaging feature，key points for diagnosis and differential diagnosis of BAC and performing early lung biopsy are contribute to diagnosing BAC at early stage and reducing the rate of misdiagnosis and mistreatment significantly.