Abstract: Lidars to observe ozone and aerosol vertical profile are widely used in environment monitor area recently. A new lidar system with both functions was introduced. The 532 nm and 266 nm light beam were generated separately with second and fourth harmonic generators using Nd:YAG laser oscillator. The 289 nm and 299 nm Raman spectrums were obtained using two Raman cells based on the theory of stimulated Raman scattering, in which one was pumped with deuterium and another was pumped with hydrogen. The ozone concentration profile was retrieved by DIAL algorithm while the aerosol concentration profile was retrieved by Mie scattering algorithm. The lidar detection results agree well with that of ozone analyzer according to the horizontal scanning experiment where the maximum relative error is less than 10%. Results observed on the science island in Hefei City, Anhui province show that the detection height is 3 km in daytime and 5 km in night time for ozone while the height is 10 km in daytime and 15 km in night time for aerosol.