Bronchiectasis does not require CT examination, but if the effect is not satisfactory after regular treatment, CT needs to be given for further clarification to exclude other diseases to avoid missed diagnosis and misdiagnosis. Clinically, bronchiectasis is a common lower respiratory tract infection, and a chest radiograph can be given during a general physical examination. If the effect of treatment is not satisfactory, CT chest examination should be considered to avoid misdiagnosis. The clinical manifestations of bronchiectasis are cough and sputum, or dyspnea if accompanied by wheezing. There are more diseases that manifest clinically as cough, sputum and dyspnea, including bronchial asthma, pneumonia, tuberculosis, bronchiectasis, pulmonary fibrosis, and lung tumors. If the cough and sputum still cannot be relieved or even worsened after about a week of treatment, especially in patients who have been smoking for a long time, CT examination needs to be given to rule out the possibility of combining other diseases of the lung, including tuberculosis, bronchiectasis, pulmonary fibrosis, or even early lung cancer.