In the paper,the extractive contents,group components and chromatography of four source rock spe-cimens in the lower part of the Fourth Member of Shahejie Formation of Paleogene,the Dongying Sag of the Bohai Bay Basin was analyzed,using the methods of the ternary extraction,supercritical extraction and chloroform extraction.

The main characteristics of supercritical anti-solvent process are reviewed,several influencing fac tors and mechanism models are studied,emphasis is on the application of SAS process preparing PLA loaded drug mi- croparticulates.