Abstract: Coking coal dust has strong adhesion, easy mud and other characteristics. The contact angle method and forward penetration method was used to test the wetting properties of coking coal and optimized the wetting agent. The results showed that the wettability difference of coking coal dust was large in different coal seam, the central seam was easy to wet. Through the comparative test of mine water and distilled water, it was obtained that the mine water was better in wetting effect. The comparative tests of ten wetting agents showed that the non-ionic surfactant was better than anionic surfactant and amphoteric surfactant. The forward penetration test turned out that the wetting agents had better wetting effect in high temperature, while the wetting effect proportionally increased with the increase of concentration in a certain range. Finally, by the wetting angle and the wetting rate method, it was determined that JFC-6 with 0.3%concentration was the optimal wetting agent.