Abstract:It has been disecovered by tissue cultivation and isotope tracing that the injection of Rhizoma Drynariaesignificantly promotes the calcification of chick enibryo bone primordium in vitro,increases the ALP activity of culti-vated tissues and accelerates the synthesis of proteoglycan. It has also been proved that the promotion of the synthesisof proteoglycan is an important factor of the promotion of calcification.