The daily change of number density of aerosol particles and quality concentration in horizontal and vertical derection are analyzed. The earosol data observated by aircraft is used in convective baundary layer under different weather conditions during autumn in 1990 over shijiazhuang area. The results show that the aerosol particles are of local ones under clear air over shijiazhuang area. The concentration of aerosol particles is from 0. 15×10^-9 to 0.85×10^-9g.cm^-3. The characteristic value of spectral distribution N₀ is from 1.5×105 to 5.5×10⁵g. cm^-3,and λ value is from 13 to 15μm^-1 below 4000 meters. The upward transport of aerosol particles is limited,and its distribution occurred discontinuity due to the inversion layer effected.The daily change of aerosol number density in the morning was greater than in the afternoon. The spectral distrbution of aerosol particles was affected for the city effected. The number density of aerosol particles over the city area was higher than that over the rural area.