Aircraft Measurements of aerosol spatial distribution properties in the central region of Shanxi Province were carried out in summer, 2013. The vertical distribution characteristics of aerosol number concentration and size were observed and analyzed, and the spectrum properties of aerosol particles in different height were studied. The results show that most aerosol particles were nucleation mode and accumulation mode on non-precipitation days in Shanxi Prov. in summer. Aerosol number concentration on haze day was 2 or 3 times larger than that on clear days. Aerosol number concentration decreased with altitude. A low-level aerosol accumulation zone was present due to the existence of temperature inversion layer. The mean aerosol particle size increased with height with the larger particles mainly distributed above 2500m. The aerosol particles spectrum usually showed a bimodal or three-modal type. The width of aerosol particles spectrum broadened slightly from ground surface to 5000m. The air mass back trajectory in observation days showed aerosol particles in high level was transported from north-west China over long distance, and aerosol particles below 3000m mainly came from the ground emissions.