Abstract: A new method was presented that adding the dust-adhering bar into the drilling hole in coal seam can decreases the infused water's surface tension and prevents vaporization for improving the infusion effect. The effect of different infustion water methods to humidify coal seam were determined. The awash method and carve wall method were taken to measure the dust-adhering bar's function to prevent vaporization. The test of adding dust-adhering bar into infused water was compared with that of generally water-infusing. The result showed that adding the dust-adhering bar into the drilling hole in coal seam can effectively prevent the infused water from vaporization, and greatly improve the dust fall effect of water infused into coal seam.