Objective To establish a HPLC method for the content determination of Ginsenoside Rg1 in Guyuling Capsule. Methods HPLC was performed on a C18 column ,the mobile phase consisting of acetonitrile-0.5 %H3PO4 (23 ∶77 )and detection wavelength at 205 nm. Results The linearity of Ginsenoside Rg1 was good in the range of 1.05 ?g ～7 ?g,r=0.999 6.The average recovery was 98.80 %,and RSD was 1.57 %.Conclusion The method is simple,feasible,and reproducible ,and can be used for the quality control of Guyuling Capsule.