Abstract:In this paper, the variation of yuanhuacine samples after vinegar-proressing and hydrolysis has beenanalyzed by HPLC.The result has shown that the content of yuanhuacine decreases hearly 22% after mimic vinegar-prcoessing. Also this procedure has brought a new compound-hydrolytic preduct of yuanhuacine, whose UV λ_(max) is264nm.The research work is to be continued.