Objective:To develop an HPLC method for the simultaneous determination of four phenolic compounds ( monocaffey-ltartaric acid, chlorogenic acid, caffeic acid and chicoric acid) in Herba Taraxaci. Methods:The separation was performed on a Ther-mo C18 column (250 mm × 4. 6 mm, 5 μm) with methanol-0. 2％ phosphonic acid as the mobile phase with gradient elution. The de-tection wavelength was 328 nm, the flow rate was 1. 0 ml·min-1 and the column temperature was 35℃. Results:The linear range of monocaffeyltartaric acid, chlorogenic acid, caffeic acid and chicoric acid was 11.59-115.90 (r = 0.9999), 2.50-24.96(r =0. 9998),2. 27-22. 70(r=0. 9995) and 12. 44-124. 40(r=0. 9998) μg ·ml-1, respectively. The average recovery was 102. 50％(RSD=2. 30％), 99. 29％(RSD=0. 43％), 96. 71％(RSD=0. 78％) and 95. 36％ (RSD=1. 30％), respectively. Conclusion:The method is simple and accurate with good repeatability, which can be used for the quality control of Herba Taraxaci.