Abstract: A pure aerosol correction method was presented to improve the calibration precision of the geometric factor profile for ground-based Raman-Mie lidar. Firstly, the analytical expression and the effect factors on the estimation error were analyzed theoretically, and compared with the Raman-Klett repeat correction method. The experiment results show the insensitive property of the pure aerosol correction method to the estimation error of lidar ratio. Then the effect of the determined geometric factor profile on aerosol extinction coefficient profile was further discussed.