Abstract: With the increases of traffic mileage, the exhaust emission of motor vehicles has become one of the major air pollution sources. In this study, we took the typical mountain road ‘24-Curve’ Highway and the surrounding sites (the foot of mountain, hillside, martyrs cemetery, viewing platform) as the research objects, to examine the common traffic emissions of heavy metals Ni, Pb, Cu, Zn, Cr, Cd, Mn and Fe using epiphytic mosses as monitoring materials. Elemental enrichment factor and fuzzy cluster analysis were used to analyze the contents of heavy metals and possible sources in epiphytic mosses. The results showed that the average enrichment coefficients of Zn and Pb in the study area were 21.83 and 18.04, respectively. Its source was mainly the release of human activities. The pollution level of ‘24-Curve’ Highway was generally much higher than that of the surrounding sites, in which the enrichment coefficients of Zn and Cd were five and seven times higher than the lowest point, respectively. The results of fuzzy clustering and correlation analysis showed that the heavy metal pollution in the study area not only came from traffic emissions (Ni, Cd), road dust and the abrasion of vehicle related materials (Cu, Zn, Cr, Cd, Mn and Fe), but also was affected by the nearby mining activities (Pb, Zn, Fe, Mn).