Abstract: Take the raw coal samples from Wangfenggang and Qidong coal mine as study object,select the sodium dodecyl benzene sulfonate,sodium dodecyl sulfate,water-reducing admixture NF and Tween-80 as surface active agent,studied the factors influencing the wettability of coal dust based on th contact angle experiment,infrared spectroscopy experiment and surface tension experiment.The research results show that the effect of surface active agent on wetting ability of coal dust is closed related to the type,concentration and surface tension of solution as well as the surface structure of coal dust.