Abstract: The fast development of day-case surgery and the continuous advancement of enhanced recovery after surgery(ERAS)are all aimed at improving the quality of recovery after surgery so that patients can go through the perioperative period more smoothly and safely. The publication of Guidelines for Day-case Surgery 2019:Guidelines from the Association of Anaesthetists and the British Association of Day Surgery, as important guidance for clinicians to safely perform day-case surgery, will help us to better understand the clinical practice and the perioperative management pathway of day-case surgery. The interpretation made a deeply evidence-based exploration in the updated contents of the guidelines, and further disclosed the development direction of day-case surgery from the perspective of ERAS.