Miq.was identified by TLC,chlorogenic acid and caffeic acid were determined by HPLC. The chromatographic column was Dikma PLATISIL ODS(250 ×4.6 mm,5 μm),gradient elution with acetonitrile and 0.4% phosphoric acid (pH≈2.5)(12∶88)was applied and the detection wavelength was 327 nm.The recovery of chlorogenic acid was 99.6% with RSD 2.16%,and the recovery of caffeic acid was 101.1% with RSD 3.26%.The established method can be used for quality control of