Lung tumors can be detected by CT examination.CT examination can effectively detect early lung tumors and clarify the location and extent of involvement of the lesion. Lung tumors are lesions occurring in human lungs, including benign and malignant tumors, which can be related to factors such as low immunity and smoking. The main symptoms may be cough, blood in sputum or hemoptysis, etc. The main clinical treatments include general treatment, surgical treatment and drug treatment. CT examination is the most important and commonly used imaging method for diagnosing lung tumors, evaluating therapeutic effect and following up after treatment, which can effectively detect early lung tumors, clarify the location and extent of lesions, distinguish benign and malignant, and guide the site of puncture biopsy. However, the gold standard for the diagnosis of lung tumor is pathological examination. The diagnosis of lung tumor should be combined with imaging examination and patient’s medical history to make a comprehensive judgment. Lung tumors should be diagnosed in a timely manner, and the patient should actively cooperate with the doctor’s treatment.