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A simple, efficient and accurate liquid chromatographic method was established to determine five flavonoid aglycones, 7-hydroxy flavonone, pinocembrin, 2′,4′-dihydroxy chalcone, 2′-hydroxy-4′-methoxy chalcone and pinostrobin in the whole plant powder of <i>Oxytropis falcata</i> Bunge. These five compounds were separated on an Agilent Zorbax Eclipse XDB-C<sub>8</sub> column (150 × 4.6 mm, 5 μm). Mobile phases were composed of water containing 0.1% <i>v/v</i> formic acid and acetonitrile using gradient elution. The established method was validated for linearity, accuracy, precision, limit of detection and quantitation, repeatability and stability.