Based on the data observed by airborne particle measurement system(PMS) under the condition of clear sky weather in summer over the Hengshui lake area,the distributive characters of aerosols have been analyzed.The results show that the size of aerosol particulates over Hengshui lake is smaller than those over Hengshui city and Zaoqiang town,and the size over the Hengshui lake area most ranges from 0.1 to 0.25 μm,and very a few from 0.25 to 3.0μm.As for the number concentration of aerosols,the concentration at the low level over Hengshui lake is larger than those over the city and town,but rapidly decreasing with height,and at the middle-upper level it is smaller over Hengshui lake than those over the city and town.The aerosol characteristics and vertical distribution over the lake different from those over the city and town.