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The aerosol optical properties, classification and radiative forcing were examined at Panyu, the main atmospheric composition monitoring station in the Pearl River Delta (PRD)region of China.Aerosol optical properties from 2006-2012 were derived by sunphotometer measurements, which were then used as input to a radiative transfer model to calculate broadband radiation.The major results are as follows: (1) High aerosol loading prevails in the dry seasons (October to the following February) of the PRD region and the particles are majority of find-mode and strong absorption.the mean AOD500mm equals to 0.535 with more frequency of high values in October and in February than in the other months.The mean value of SSA440nm is 0.87 and more than 80% of SSA440nm ranged from 0.8 to 0.92.The mean value of AE470-870nm is 1.33, and the aerosols are dominated by fine-mode pollutions(AE470-870nm>l.2, ~84.66%) with low occurrence of floating dust particles (0.75< AE470-870nm
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