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The Pearl River Delta(PRD)region has experienced remarkable economic development and urbanization in the past two decades．Haze pollution became more serious in the last five years and becomes a very．concemed regional air pollution problem．In this paper,the online Weather Research and Forecasting and chemistry(WRF/CHEM)model，coupled with urban canopy OACM)and biogenic-emission models,is used to explore impacts of urban expansion on secondary organic aerosols formation．Two scenarios of urban maps are used in WRF/CHEM to represent early 1990s(pre-urbanization)and current urban distribution in the PRD．Month-long simulation results using the above land-use scenarios for March 2001 show The relative vailation of SOA from anthropogenic VOC emissions have two inereased centers which locate in Zhongshan and northern Guangzhou．about 10-15％increase for Aitken mode and 9％for Accumulate mode．Shenzhen and northern Hong Kong are the centers for decrease,around 15％decrease for Aitken mode and 6％for Accumulate mode．The influences of urbanization on SOA formation due to different precursors are different．The variations of Aikanes and Aromatics on SOA formation ale increase,around 8％and 14％respectively，while the variation of Alkenes on SOA formation is decrease about 8％．