Abstract:Characteristics of the time series of daily average and diurnal variation of aerosol optical properties under the condition of non-rain were analyzed with the scattering and dabsorption coefficients of atmospheric aerosols obtained during July to August in 2011at the Guangmingding meteorological observatory on Mt. Huang. And the analysis of aerosol optical properties in different air masses was conducted by using Hysplit model. The results showed that the aerosol scattering played a dominant role in the total extinction. The average value (standard deviation) of the scattering coefficients (σsc), absorption coefficients (σab), single scattering albedo (SSA) and backscattering ratio (BSR) were 62.59 (49.17) Mm-1, 5.49 (3.67) Mm-1, 0.89 (0.04) and 0.13 (0.02), respectively. σsc , σab and SSA were higher during the day and lower at night while backscattering ratio was the opposite. The mainly influencing factor of the diurnal variation of aerosol optical properties were the activity of the boundary layer and the mountain and valley winds. There were a marked difference in the aerosol properties at different air masses. The highest value of the cluster-mean of σsc, σab and SSA appeared in the air masses from northwest (continental air mass) and the lowest value appeared in the air masses from southwest (marine air mass). The results indicated that the substantial secondary aerosol production was the main influencing factor during the long-range transport.