Picking up the leaves of Osmanthus fragrans‘Liuye Jingui' in 50 years old,determination the quercetin,chlorogenic acid and rutin by HPLC.The results showed that the mobile phases of Quercetin,Chlorogenic acid and Rutin are metho- nal-acetonitrile-0.4%phosphoric acid(3:27:70),acetonitrile-0.4%phosphoric acid(17:83),methonal-0.4%phosphoric acid(33:67) respectively;and the UV detection was operated at 363nm,327nm,254nm respectively.The contents of quercetin, chlorogenic acid and rutin were 0.416,0.668,14.333mg...