To optimize the preparation of glycyrrhizic acid chitosan microsphere with uniform test design,the stability and release of microsphere were studied.The chitosan microsphere was prepared by emulsion-chemical cross-link method.The equation and condition was gained by SPSS soft dealing with the date.The results showed that the determined and predicted values were accordant.The microsphere could be stored at 15-25 ℃ or 4 ℃ and sterilized by 60Co;the release kinetics of microsphere was described by first-order ...