Objective To establish a quantitative method for rhein,emodin and chrysophanol in Dahuang Dispensing Granule by RP-HPLC.Methods The sample were separated by Kromasil ODS column(250 mm×4.6 mm,5 μm)with methanol-phosphoric acid 0.1%(85∶15)as mobile phase,detection wavelength at UV 254 nm.Results The linear relationship was the range of rhein within 0.010 9~0.218 0 μg,emodin in 0.011 2~0.224 0 μg and chrysophanol in 0.011 9~0.238 0 μg,respectively.The average recovery of rhein was 100.6% with RSD of 0.92%(n=9)...