Accurate assessment of microcirculation status in critically ill patients is of great value in guiding clinical decisions on fluid resuscitation,the use of vasoactive medications,and renal replacement ther-apy.This article introduces the common methods,effects and precautions for evaluation of microcirculation status in these patients based on evidence-based evidence,aiming to provide guidance to diagnose microcircu-lation disorders in time and improve treatment levels.