Non-occlusive mesenteric ischemia(NOMI)is a series of disorders of digestive tract caused by local blood perfusion damage,which is caused by vasospasm.As an extremely dangerous disease,NOMI is also a common intestinal complication in intensive care unit,especially in patients with hemodynamic instability after cardiac surgery,and the mortality is high.Cardiac surgery aims to improve the prognosis of patients,while the complication of NOMI is easy to be ignored,which hindered the recovery of postoperative patients.Due to the rapid development and lack of specific symptoms and signs,NOMI is easily misdiagnosed as other gastrointestinal complications.Therefore,timely and effective diagnosis of NOMI is the most important factor affecting the prognosis of post cardiac surgery.This review systematically summarized the related research on NOMI after cardiac surgery,and comprehensively concluded the cause,mechanism,treatment as well as prognosis of NOMI.Then we emphasized on the latest progresses of diagnostic methods for NOMI,in order to provide directions on the accurate identification and timely intervention of NOMI in clinical work.