Objective: To determine the contents of ?-Asarone and ?-Asarone in Xing Nao nasal drops. Methods: HPLC was used with ODS C18 column (150mm?4.6mm, 5?m). Methanol mixture : water being 6 : 4 and Patassium biphoepate 1.4 and Dodecyl Sulphonic acid sodium salt 1.2g in 1000mL mixture served as mobile phase, detection wavelength at 257nm and flow rate being 1.0mL/min. Results: The mean recovery was 99.38 %(RSD=2.25 %) for ?-Asarone and 96.59 %(RSD=2.16) for ?-Asarone. Conclusion: this method is simple,rapid and accurate.