In this study transport processes of airborne particulates originated from Shanxi to the Beijing region during the period of 3 to 9 September 2002 are investigated by use of the Community Multi-scale Air Quality (CMAQ) modeling system with the meteorological fields simulated by the Regional Atmospheric Modeling System (RAMS). The influences of the complex terrain and the weather conditions on the transport processes as well as contribution of the pollutants from Shanxi to the particulate concentrations over Beijing are discussed. The results indicate that the pollutants emitted in Shanxi can be transported to Beijing along certain pathways, and these pathways are quite different due to the difference in source locations in Shanxi. Contributions of the Shanxi sources to the PM10 concentrations over Beijing are up to 10～30μg/m3 in the surface layer while up to 30～70μg/m3 at a height of 500m.