The invention provides a flavonoid new chemical entity, which has little moisture absorption and good storage stability, and is applicable to preparation of food or health food or drugs for reduction of capillary fragility, treatment or prevention of chronic venous insufficiency, hemorrhoid, scurvy, venous lower limb ulcer, premenstrual syndrome, diabetics' microangiopathy and secondary upper limb lymphedema, cardiovascular diseases, blood glucose and lipid regulation, antisepsis and inflammation reduction, virus resisting, cancer resisting, immunity adjustment, radiation protection, liver protection, rheumatoid arthritis or arthritis resisting, ulcer resisting, phlegm eliminating, asthma relieving, black spots, freckles, free radical resistance, and oxidation resistance.