Chronic bronchitis diagnosis can be divided into three steps, as follows: 1, symptoms and time diagnosis, chronic bronchitis common symptoms are coughing, coughing up sputum or with wheezing, when these symptoms last long enough, usually lasts more than 3 months per year without relief, for two consecutive years, or even more than two years have the same symptoms, this is the first diagnostic criterion of chronic bronchitis; 2, chronic bronchitis patients to do chest X-ray or CT examination of the lungs can be found on the imaging changes in the imaging of the patient’s bronchial tube is disordered, coarsening, healthy people’s image of the outer band of the lungs do not have bronchial texture, but the texture of chronic bronchitis patients will be migrated to the outer band, and it is very thick, chaotic, sort of twisted, expansion, etc., which is the diagnosis of the imaging; 3, we should ask the patient whether he/she has a history of smoking or occupational exposure, such as whether he/she has been exposed to dust or work exposure to particles, etc., so the diagnosis of chronic bronchitis is based on the following criteria More and other history, so the diagnosis of chronic bronchitis mainly depends on the symptoms, duration, imaging diagnosis, as well as medical history diagnosis.