Abstract：Road fugitive dust is one of the major sources of particulate matter in urban environment. Heavy metals， carbonaceous components and water-soluble ions in road fugitive dust are harmful to human health. In order to estimate the emissions and investigate the chemical compositions of road fugitive dust in Xi’an， 141 samples of road surface silts were collected at monitoring sites set up on the ring road， main road， sub-main road and branch road of Xi’an. The average loadings of road silt on different types of road were calculated. Emission inventories and factors of road fugitive PM2.5 and PM10 on the roads in 2018 were obtained using the AP-42 model. The chemical compositions of samples of road fugitive dust were also analyzed. The spatial allocation of road fugitive dust emissions was obtained based on road network distribution， GIS information and traffic flows in Xi’an. The results showed that the silt loadings of motorway， non-motorway and pavement in Xi’an were （0.88±0.83）， （2.62±2.23） and （1.41±1.42） g·m-2， respectively. The road-length weigh-average emission factors of PM2.5 and PM10 were 0.22 and 0.93 g·km-1·veh-1， respectively. The PM2.5 and PM10 emissions of road fugitive dust in Xi’an in 2018 were （1.78±0.47） ×104 and （7.35±1.96） ×104 t， respectively. In road fugitive dust， PM2.5 mass accounted for 24.2% of PM10 mass. The sum of Ca and Si masses contributed to 38.8% PM10 mass. Heavy metals， carbonaceous components （OC and EC） and water-soluble ions （NO3- and SO42-） accounted for 1.9%， 4.2% and 19.8% of PM10 mass， respectively.