Abstract:To choose optimal flow phase parameters and establish a content determining of ginsenoside Rg1, Rb and notoginsenoside R1 in HuangQi Capsules by HPLC. Methods:The octadecyl silane chemically bonded silica was used as filler, acetonitrile as mobile phase A and water as mobile phase B. Results:The optimum gradient:0~30 min,acetonitrile:19→40,and water:81→60. On this condition, the sample size of ginsenoside Rg1:0.8496~7.6464 μg, Rb1:0.8538~8.8538 μg, and notoginsenoside R1:0.2020~2.0200 μg, were all in good liner relation with peak area. Conclusion:The mobile phase gradient elution scale improved peak area and number of theoretical plates, and saves time.