Abstract: In order to study the characteristics of fugitive dust emission from unpaved roads and control efficiency of chemical dust suppressant,this paper tested the PM₁₀ emission before and after the application of suppressant,and the PM₁₀ emission flux was calculated with the wind speed and wind direction data.The results suggest that the concentration of PM₁₀ near the tested road is relatively high and the daily average value reaches 0.54 mg/m³,and the PM₁₀ concentration and emission flux declined clearly after application of the suppressant0.Based on the traffic volume and wind speed data,it can be found that the key influence factors of dust from unpaved roads are the disturbing of traffic and wind.The control efficiency of the chemical dust suppressant applied is 78%~93% in the tested time,and the largest value is 93% when the traffic volume is high.90 days after the application of suppressant,the control efficiency is still larger than 50%.