An airborne two-wavelength polarization Mie lidar is designed for detecting three-dimensional (3-D) distributions of atmospheric aerosols at Jing-Jin-Ji area. One typical field campaign is described. The flight path is perpendicular to the airstreams, which makes it ideal for observation of aerosol 3-D structure on the flight path. The observation result of the aerosol distribution during the flight shows that regional three- dimensional air pollution has formed around Jing-Jin-Ji area, due to densely pollutant source and air-flow diffusion. The diffusion process of the aerosol emission from one typical heavy pollution source is given using the aerosol distribution data around it. The preliminary result shows that this airborne lidar provides a unique airborne remote sensing platform for monitoring the aerosol distribution over a wide region.