Ursolic acid and oleanolic acid in Acantopanax senticosus (Rupr. et Maxim.) Harms were extracted with the ultrasonic technology. A determination method of ursolic acid and oleanolic acid was established with the high performance liquid chromatograph and photodiode array detector. The chromatographic column, Nova-Pak C18 (3.9×300 mm, 4 μm), methanol-water (88∶12,V/V), mobile phase with 0.8 mL/min flow rate, the detected wave length (210nm),and the column temperature(25 ℃) were adopted. The calibration curve of ursolic acid was linear under the content of 0.136 ~1.224 μg and the correlation coefficient was 0.9995. The calibration curve of oleanolic acid was linear under the content of 0.052 ~0.468 μg and the correlation coefficient was 0.9994. The average recovery of ursolic acid was 98.1 % and RSD was 1.1 % (n=5). The average recovery of oleanolic acid was 97.5 % and RSD was 1.0 % (n=5). The content determination of HPLC is accurate and reliable, and can be used to analyse quantificationally ursolic acid and oleanolic acid in Acantopanax senticosus (Rupr. et Maxim.) Harms.