Abstract: On the basis of theoretic analysis and monomer testing, the composition and concentration of a dust suppressant used in tailings dams were determined initially, and then the best prescription was developed by the orthogonal test. The environmental adaptability simulation test of the dust suppressant in the laboratory were carried out, including compressive strength, water resistant, freeze-thaw resistant and wind erosion resistant. The result showed that the dust suppressant had a very strong ability of water resistant, freeze-thaw resistant and wind erosion resistant, and the shell compressive strength was 247 kPa. The dust suppressant was tested by field spraying in the tailings dam of a golden mine. The shell was continuous and integrated after going through the weatherbeaten for 203 days, and could bear strong wind (18 m·s^-1) blowing. It is shown that the dust suppressant has very good dust suppressing performance and strong environmental adaptability.