Angstrom wavelength exponents can well reflect the size of atmospheric aerosol particles. Raman method supposes less parameters but acquires higher precision when compared with Mie method. The L625 Raman-Mie dual-wavelength lidar which has been developed for observations of tropospheric aerosol optical properties is presented,then the tropospheric aerosol wavelength exponents are calculated and analyzed using data from L625 lidar. Some typical characteristics of tropospheric aerosol optical properties are observed and discussed.Results indicate that L625 lidar is reliable for the measurement of tropospheric aerosol wave-length exponents.