The aim of this project is to compute lidar ratio and aerosol optical depth: AOD in the atmosphere of continental area by numerical simulations. With the 90% relative humidity, 532 nm laser wavelength, lidar ratio and AOD are obtained. The aerosol size distribution (with in 0.1-0.6 µm radius) of three components i.e. water-solution, water-insoluble, and soot are determined as well. The results show that reflective index has an effect on aerosol backscattering coefficient, yielding a variation in lidar ratio around 68.81-70.59 sr with 0.734 AOD at the height of 2 km where is polluted and has high attenuation of water-soluble aerosols.