Objective：To analyze and compare CT manifestations and clinical pathology of bronchioloalveolar carcinoma in young people，so as to improve the diagnosis of this disease. Methods：78 young patients of bronchioloalveolar carcinoma confirmed by sur－gical pathology were retrospectively analyzed. According to the pathological manifestation，the patients were divided into 3 groups as follows: isolated-nodule group （28 cases），multiple-nodules group （24 cases），and lobar-consolidation group （26 cases）. The imag－ing features of lung cancer in different groups were compared and studied. Results：In isolated-nodule group，specific signs such as lobulation，air bronchogram，and pleural indentation were showed relatively more than those in the other two groups. Multiple-nodules group showed diffuse multiple nodules in both lungs，broken stone road signs，and were often accompanied by pleural traction. Lobar-consolidation group showed low density of lungs，honeycomb lung sign，angiography sign，dry branches sign and multiple acinar nod－ules. Conclusion：Understanding CT manifestations and clinical pathology of bronchioloalveolar carcinoma in young patients can help to improve preoperative diagnosis of this disease.