Abstract: We introduce the design of ultrasound assisted supercritical fluid CO₂ extraction equipment,and discuss application,model and the ultrasound enhancing mechanism.Compared with other enhancement methods,ultrasound assisted method has advantages such as free of pollution and high enhancement efficiency.Assistance of ultrasound not only cuts down the pressure of extraction system,extraction temperature,modifier dosage and extraction time,but also enhances extraction yield.At the same time,it does not change the structure of extracted object.