To determine whether it is eosinophilic bronchitis, it is usually judged from several aspects, such as etiology, medical history, symptoms and signs, and auxiliary examination. 1. Etiology: mainly related to inhalation of allergens and occupational exposure to chemical agents or chemicals, such as chloramines, powders, isocyanates, rubber gloves, etc. 2. medical history: no history of bronchial asthma, chronic obstructive pulmonary disease or other allergies. 3. Symptoms and signs: the main manifestation is chronic cough (more than 8 weeks), mostly dry cough or coughing a little white mucous sputum, the duration of time varies, no other obvious symptoms and signs. 4. Auxiliary examination: lung function within the normal range, X-ray examination without abnormal performance, induced sputum eosinophil count increased significantly, capsaicin test suggests that the cough sensitivity measurement hyperactivity. Patients should seek timely medical treatment when uncomfortable symptoms occur, and make diagnosis under the guidance of doctors, do not make blind judgment on your own, so as not to affect the condition.