Lung adenocarcinoma stage 1B belongs to early stage. Lung adenocarcinoma stage IB belongs to T2aN0M0 stage in TMN staging, and patients need to take surgical treatment, radiotherapy, targeted drugs and other treatments. 1. Surgical treatment: anatomical lobectomy + hilar mediastinal lymph node dissection can be used. If there are no high-risk factors such as poor differentiation, cancer embolism in the vasculature, wedge resection of the tumor, tumor diameter greater than four centimeters, resulting in pleural involvement, or insufficient lymph node dissection, conventional adjuvant chemotherapy is usually not needed after surgery. 2. Chemotherapy: patients who are not suitable for surgery can be treated with radiotherapy to kill the tumor, commonly used chemotherapy drugs such as pemetrexed + cisplatin, or vincristine + cisplatin. Commonly used radiotherapy methods include stereotactic radiotherapy. 3. Targeted drugs: For old and weak patients who cannot tolerate chemotherapy, they can also undergo genetic testing and try targeted therapy to reduce the risk of tumor recurrence and metastasis. Commonly used drugs include gefitinib, erlotinib and so on. Patients need to seek timely medical treatment and actively cooperate with doctors. Normally, it is necessary to keep a relaxed mood and eat more vitamin and protein-rich food.