1.Nowadays, BAC of fine bronchoalveolar carcinoma no longer has this name and is divided into four categories, such as AIS and MIA. 2.AIS and MIA are early stage carcinomas with better prognosis, so surgery must be pursued. 3.BAC must pay attention to multiple lesions in the lung. 4, overall BAC has a better prognosis, although the treatment response rate is low 5, it is recommended to do EGFR gene mutation detection, and try to use Erythroxa or Troche if possible. 6, Do not refuse chemotherapy, although in the past, chemotherapy was considered ineffective, but in recent years there have been changes. Radiotherapy can be considered locally. 7, If very rich, all of the above have been tried, hope that a miracle lung transplant is the last to consider.