The tropospheric aerosols in the northern suburb of Nanjing is observed and analyzed with the Rayleigh-Raman-Mie lidar in Nanjing comprehensive observation base of the China Meteorological Administration. The Raman scattering signals with the wavelength of 607 nm are smoothed by the wavelet denoising method on the basis of soft threshold filtering. The extinction coefficient of upper tropospheric aerosols is retrieved based on the data from Raman channel of the lidar. The backscattering coefficient and the lidar ratio of upper tropospheric aerosols are retrieved with the Mie scattering signal with the wavelength of 532 nm. The experimental results show that the wavelet denoising method on the basis of soft threshold filtering can remove the signal noise well and improve the accuracy of the retrieval results. In sunny and cloud-free day, the extinction coefficient of upper tropospheric aerosols is from 0.03 km -1 to 0.07 km -1, the aerosol backscattering coefficient is from 0.011 km -1·sr -1 to 0.024 km -1·sr -1, and the lidar ratio is from 22 sr to 52 sr. It is indicated that there are still some aerosol particles in upper tropospheric of the northern suburb of Nanjing. Cirrus clouds have been measured many times during the experiment. The lidar ratio cirrus clouds is 17 sr±10 sr.