Supercritical fliud has the mobility of liquid, as well as the premeability and difussivity of gas. It has strong solubility for the raw material. CO2 is the most widely used SFE medium. Supercritical CO2 extraction technology is the most advanced, green and environmental friendly extraction and separation technology. It uses special dissolve performance of supercritical CO2 fluid which under critical pressure and critical temperature to extract, separate and purify effective components.