The following conditions should be listed as contraindications or relative contraindications to outpatient anesthesia, or at least anesthesia should be administered with caution and under close monitoring 1, respiratory tract infection; 2, severe chronic obstructive pulmonary disease; 3, gastric retention; 4, acute upper gastrointestinal bleeding; 5, shock, severe cardiac, cerebral, hepatic and renal failure; 6, pregnancy and lactation; 7, children less than 3 years of age; 8, severe snoring and excessive obesity; 9, severe bradycardia; 10, history of allergy to sedative drugs; 11, acute peritonitis; 12, colonic torsion or Extensive adhesions; 13, severe wasting or malignancy; 14, 6 hours before the examination had water or food; 15, epileptic patients.