Bronchoscopy is divided into pre-examination as well as post-examination precautions, including pre-operative preparation, post-operative dietary attention. 1. Before bronchoscopy: bring a pack of tissues for spare parts, as the examination will cause coughing, nausea and other discomforts. Fasting for at least 4 to 6 hours, 2 hours of water, because the examination may cause coughing, to avoid causing vomiting, food reflux leading to aspiration. Do not wear dentures, have loose teeth and other special circumstances need to inform the doctor, can not talk during the examination. 2. After bronchoscopy: coughing with a small amount of blood is a normal phenomenon, because the examination may stimulate the mucous membrane on the surface of the trachea. Cough gently after the examination to avoid sore throat, drink a small amount of lukewarm water 2 hours after the examination, eat a small amount of semi-fluid food without choking, avoid spicy, stimulating, hard food, rinse your mouth in time after the meal to keep your mouth clean. In addition to the above precautions, the most important thing is to follow the doctor’s instructions, and actively cooperate with the perfect examination.