Management of perioperative nutrition support        XU Yuan. Beijing Tongren Hospital Affiliated to Capital Medical University，Beijing 100730，China
Abstract    Optimal nutrition support in the patients perioperatively should based on right nutritional therapeutic strategies，for right patients，at right time and under right dose. The nutrition risk and malnutrition assessment are important to identify which patients may benefit from nutritional intervention. Several nutrition guidelines published by the societies such as ASPEN、ESPEN、German Society for Nutritional Medicine (DGEM)，Australian and New Zealand Intensive Care Society (ANZICS) and Canadian Clinical Practice Guidelines (CPGs) in the past decade，the recommendations to use enteral route prefer to parenteral for delivery of nutrition if possible is clear，and more benefit if it starts earlier，doctor will have to weigh the safety and benefits of initiating PN in patients who not tolerating EN well and the host of factors，like nutrition risk，severity of disease. Optimal timing of nutrition support is still remains a controversial topic in critically ill patients，but early enteral feeding and later parenteral supplement is recommended generally. The optimal dosing of nutritional delivery in surgical patients are providing sufficient energy and protein to minimize the catabolic loss associated with stress，injury (surgery) . While also avoiding the problems associated with overfeeding，especially during parenteral nutrition. In patients with enteral feeding，it is more important and necessary to calculate and evaluate actual amount of nutrition supply but not the dose of prescription. For best practice of nutrition support，a standardized EN/PN protocols will help in the effects of shortening duration of mechanical ventilation and a reduced mortality，so a good strategies and well management are key points of reaching the goal of optimal nutrition support in surgical patients perioperatively.