Propofol is a kind of intravenous anesthesia drug, which is often used in intravenous general anesthesia surgery, sometimes in doing local anesthesia, or epidural anesthesia will be added with propofol, in order to make the patient have a better analgesic, and sedative effect. Patients in the treatment process can sleep, while reducing the patient’s sense of fear, in doing adult painless gastroscopy or colonoscopy, will also be used to the drug. Patients in the treatment process without pain, also do not need to be intubated through the orotracheal tube. General anesthesia not only has intravenous anesthesia, but also transoral intubation general anesthesia, especially the latter generally also need propofol, but also through the oral insertion of the trachea. At this time the patient will not breathe, is in the ventilator-assisted breathing, often in doing minimally invasive laparoscopic surgery, or large-scale surgery applied to.