The vertical distributions of aerosols are obtained based on the micro-pulse LiDAR. We analyzed coefficients at different altitudes in January and February 2013. The results show that aerosol vertical distributions of clear days are non-homogeneous with multiple layers at different altitudes

while aerosols are concentrated in the layer below than about 1 km during severe haze days. Analyses show that aerosol extinction coefficients are larger in heavy haze days

reaching up to five times of that of medium polluted days and 50 times of that of clear days. It is also found that Aerosol Optical Depth（ AOD） is in good relation to aerosol e xtinction coefficients at 400 m during this haze event.