Abstract: In order to study the detection of horizontal visibility and vertical aerosol extinction coefficient by monitoring pollutants lidar, the extinction coefficients of 301.5nm and 446.6nm in horizontal and vertical directions and wavelength Ångström index were retrieved by the slope method and the Fernald method. The result shows that, in the horizontal direction, the extinction coefficients and visibility of 301.5nm and 446.6nm vary with time consistently. In the vertical direction, the extinction coefficients of 301.5nm and 446.6nm follow the same trend in time and space. The Ångström index has changed with the change of time. But the spatial change trend is the same. The results are helpful to correct the effect of analytical differential absorption lidar on aerosol.