For patients undergoing ultrasound endoscopy, the preparation is the same as that for gastroscopy and colonoscopy, as follows: 1. Diet: patients need to fast for 4-6 hours, and eat less dregs of easily digestible food for dinner the day before the examination; 2. Medication: lidocaine syrup 10mL in 15-30 minutes before the procedure, followed by intramuscular injection of scopolamine butylbromide 20mg, and for those who are nervous, intramuscular injection of diazepam 5- 10mg. Spray anesthesia is administered to the pharynx. For some patients, if they cannot tolerate normal ultrasound endoscopy, painless ultrasound endoscopy can be performed directly, while for patients undergoing colon ultrasound endoscopy, the bowel should be cleaned according to the preparation for colonoscopy before surgery; 3. Position: the same as normal gastroscopy patients take the left side lying position, both lower limbs are slightly flexed, unbuckled collar, relaxed belt, head slightly tilted back, and the position can be changed if there is a need for examination.