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To clarify the aerosol hygroscopic growth and oprical properties of the Pearl River Delta (PRD) region,integrated observations were conducted in Heshan City of Guangdong Province from October 19 to November 17,2014.The concentrarions and chemical composirions of PM2.5,aerosol optical properties and meteorological parameters were measured.The mean value of PM2.5 increased from less than 35 (excellent) to 35-75 μg/m3 (good) and then to greater than 75 μg/m3 (pollution),corresponding to mean PM2.5 values of 24.9,51.2,and 93.3μg/m3,respectively.The aerosol scattering hygroscopic growth factor (f(RH =80％)) values were 2.0,2.12,and 2.18 for the excellent,good,and pollution levels,respectively.The atmospheric extinction coefficient (σext) and the absorption coefficient of aerosols (σap) increased,and the single scattering albedo (SSA) decreased from the excellent to the pollution levels.For different air mass sources,under excellent and good levels,the land air mass from north Heshan had lowerf(RH) and σsp values.In addition,the mixed aerosol from the sea and coastal ciries had lowerf(RH) and showed that the local sources of coastal dries have higher scattering characterisrics in pollution periods.