The optical characteristics of aerosol over Naqu and the suburb of Beijing in combination with Micro Pulse Lidar(MPL) were measured and analyzed. The vertical distribution of aerosol extinction coefficients over the Naqu was showed in comparison with the results over the suburb of Beijing and the heights of Planetary Boundary Layer of Naqu are discussed. The results indicates that the components and concentration of aerosol are more uneven in Beijing than in Naqu,and the quality of air is better in Naqu than in Beijing. Consequently,MPL is a useful tool for monitoring aerosol in atmosphere.