There is no such thing as the most effective test to diagnose bronchiectasis. The diagnosis of bronchiectasis should be made through a comprehensive analysis and judgment of clinical symptoms, laboratory tests, imaging tests and other results. 1. Clinical symptoms: The most common clinical symptoms caused by bronchiectasis include cough, sputum, hemoptysis, dyspnea and chest pain, and the amount of cough and sputum will be increased when combined with infection. Wet rales can be detected by auscultation. 2. Imaging: High-resolution CT of the chest is the main imaging modality for the diagnosis of bronchiectasis. 3. Laboratory tests: Blood inflammatory markers, immunoglobulin, protein electrophoresis, microbiology and blood gas analysis are also important for the diagnosis and evaluation of bronchiectasis. If the diagnosis of bronchiectasis is confirmed, rational and standardized treatment is recommended under the guidance of doctors.