Abstract: A dustproof method, adding dust-sticking bar to infusion, was studied. This method can reduce contact angle and shorten wetting time. The contact angle and the wetting time of seven coal samples in the dust-sticking bar's solution with different concentrations were analyzed to obtain the critical surface tension of the seven coal samples. It was concluded that the wetting effect of coal seam infusion primarily lies on the surface tension of injected water. By this method, the dust of coal seam can be greatly decreased and the adding technical process is simple, convenient and practical.