Abstract:In order to study the characteristics and its mechanism of PGEs acculation in road dusts from different types weather, Changji city was elccted as an example, and samples of road dust were collected and determined by ICP-MS after aqua regia digestion. The results showed that runoff souring and wind strength were the primary external forces, which affected PGEs transport and transfer, while the rainfall and temperature primarily affected the formation of runoff in urban city, poor rainfall in arid area was more beneficial for accumulation of PGEs. Influences of various weather situations on PGEs content in road dust were as follows: the PGEs content increased after small rainfall (12hours rainfall5mm); but always decreased after snowfall, no matter how big, when the temperature was lower than 0℃. After single small rain, single moderate and bigger rain(12hours rainfall>5mm), and continuous small rain, the PGEs contents increased, decreased, and increased respectively, however, when the accumulation achieved top limit, there was no increasing but slow and steady decreasing tendency in continuous small rain. After a wind force 4, the PGEs content decreased significantly.