Abstract: The critical ultrasound plays a key role and is of great value in circulation management in ICU. The critical ultrasound can rapidly diagnose the causes of cardiac arrest and acute circulatory failure， and conduct continuous， dynamic and refined ultrasoundguided circulation management， and assess multiple organ perfusion. Critical care specialists can make the critical ultrasound as a powerful tool for management of critically ill patients.

Key words: ultrasonography；shock, hemoperfusion