Abstract: Through the field investigation and analyses of the distribution of different types of roads, traffic volume and the composition of vehicles in Beijing, the average weight of vehicles on different types of roads,traffic volume and the composition of vehicles are figured out in the paper. By sampling and analyzing silt loading on different types of roads, the average silt loading volume is worked out. Based on the AP-42 emission factor model, particles’（TSP、PM10、PM2 5 ) emission factors of every road are all made out. Taking into account road distribution in different districts and mileages of vehicles, the paper finally sets up road fugitive dust emission inventory.