Degreasing treatment with petroleum ether is a common step in extracting processing of plant flavonoids.In order to explore the effects of degreasing treatment on flavonoids extraction,the plant leaves of Coriandrum sativum L.are used to conduct a comparative research on the decreasing treatment with petroleum effect and then test its treat duration.The results suggest that degreasing treating after hot alcohol reflux extraction leads to higher flavonoids content than the control without degreasing treatmen...