OBJECTIVE： To establish a method for simultaneous determination of 7 kinds of anti-rheumatic active ingredients in Mongolian medicine Sendeng-4 decoction powder， such as catechin， jasminoidin， dihydromyricetin， texifolin， rutin， myricetin and quercetin. METHODS： HPLC-DAD method was adopted. The determination was performed on Sil Green C18 column with mobile phase consisted of acetonitrile-0.1％ phosphoric acid solution （gradient elution） at the flow rate of 1 mL/min. The detection wavelength was set at 238 nm， and column temperature was 30 ℃. The sample size was 10 μL. RESULTS： The linear range of catechin， jasminoidin， dihydromyricetin， texifolin， rutin， myricetin and quercetin were 8.590-2 290， 10.56-3 901， 13.00-3 958， 8.815-564.2， 4.030-257.8， 8.130-750.5， 7.075-454.2 μg/mL （r≥0.999 1）， respectively； the limits of detection were 0.429 5，  0.264 0， 0.325 0， 0.220 4， 0.201 5， 0.203 2， 0.176 9 μg/mL， respectively； the limits of quantification were 1.030， 1.321， 1.302， 1.397， 1.637， 0.813 0， 0.707 5 μg/mL， respectively. RSDs of precision， stability （48 h） and repetition tests were all lower than 2.0％ （n＝6）. The average recoveries were 96.24％-99.28％ （RSD＝1.03％-1.63％， n＝6）. CONCLUSIONS： The established method is simple， accurate and reproducible， and can be used for simultaneous determination of catechin， jasminoidin， dihydromyricetin， texifolin， rutin， myricetin and quercetin in Mongolian medicine Sendeng-4 decoction powder.