Method for determination of furostanol saponin a in crude saponins from Tribulus terrestris by HPLC was established.The chromatog. conditions were as follow: Diamonsil C18 column (250 mm × 4.6 mm, 5μm), acetonitrile -water (29:71) as mobile phase, flow rate at 0.7 mL·min-1, flow rate at 2.0 L·min-1.There was a good linearity within the range of 1.376∼8.256 μg.The average recovery rate was 100.24% with RSD of 1.6%.The sample contents were 80.8∼107.6 mg·g-1.This method is reliable, simple and accurate.