Chronic bronchitis and bronchiectasis are both airway lesions, and limited bronchiectasis can also occur in the late stage of chronic bronchitis, and the two can be differentiated as follows: 1. Medical history: chronic bronchitis manifests as recurrent chronic cough with coughing sputum; bronchiectasis mainly manifests as coughing and coughing up large amounts of pus sputum, accompanied by infection symptoms such as fever, malaise, and sometimes hemoptysis; 2. Imaging changes: chest X-ray or Bronchiectasis is mainly characterized by columnar or earthworm-like changes in the airways at the terminal sites. 3. Treatment: treatment for bronchiectasis is based on expectoration and cough suppression; bronchiectasis is mainly anti-infective treatment, including anti-bacterial, anti-viral and anti-fungal treatment.