This paper studies the high-temporal-resolution properties of atmospheric extinction,especially aerosol extinction,with the hourly data of relevant factors(including total atmospheric extinction coefficient,absorption coefficient of gas molecule,absorption and scattering coefficients of aerosol,and inhalable particle number concentration) for the year of 2010 in Shenyang area.Results show that the total extinction and aerosol scattering coefficients both show a single cycle pattern with a peak in 05:00—06:00 BST and a valley at 15:00 BST in one day.The total extinction coefficient is the highest in snowy days,then in hazy days,and it is the lowest in sunny days.The correlation coefficient between the aerosol extinction coefficient and the particle number concentration increases with the decreasing of particle size.