The formation and development of lung cancer is mainly based on central type lung cancer and peripheral type lung cancer. Central type lung cancer can be divided into three conditions, such as ductal growth, ductal wall growth, and extraluminal compression. Ductal growth tumors are prone to cause obstructive pneumonia and obstructive atelectasis at an early stage, forming symptoms such as dyspnea, cough, blood in sputum as well as lung infection and fever, which require active anti-infection treatment. Tumors growing in the duct wall also tend to form luminal narrowing gradually, resulting in dyspnea and even blood in sputum, which require early fiberoptic bronchoscopy to find out whether there is bronchial wall occupancy. Tumor growing outside the lumen causes compression of the bronchial wall, and fiberoptic bronchoscopy reveals that the lumen is clear under the microscope, but traces of external pressure can be seen. Peripheral lung cancer is divided into three cases: ground glass nodules, partially solid nodules and solid nodules, which gradually grow and expand, forming short burrs, lobulated, pleural traction signs, pleural depression signs and other early lung cancer manifestations, requiring enhanced CT of the chest and, if necessary, percutaneous lung aspiration histological examination for early surgical resection and treatment.