Basic structure of Raman scattering lidar in northern suburb of Nanjing is introduced. Treatment method of the data of stratospheric atmospheric aerosol extinction coefficient profiles inversed by Raman scattering lidar principle is described. Stratospheric aerosol observational data on December 8 and 9, 2011 in northern suburb of Nanjing are emphatically processed. The Raman scattering lidar distance correction signal is denoised by wavelet under four different thresholds. Appropriate threshold is used to obtain the stratospheric atmospheric aerosol extinction coefficient profile by the formula of inversion principle. Variation characteristics of aerosol extinction coefficients in the stratosphere are analyzed at the same time.