Abstract: It is essential to add penetrant into water injection to accelerate this process, to make coal wet evenly and reduce the dust concentration of heading face. The seams of Xingdong Coal Mine have been chosen as samples of study, which will be used for relevant performance tests of five kinds of penetrating agent monomer. The contact angle, critical surface tension, surface tension, wetting rate and other parameters will be separately measured at different concentrations solution. According to the results of study, the penetration effect of pure water is poor with the surface tension of 72 mN/m and contact angle of 74°. While the penetration effect of the solution into which the penetrant has been added is quite remarkable with the surface tension dropped to 30 mN/m and contact angle dropped to 29°. Based on the experiment, the comparative analysis of the variation laws of parameters in pure water and solutions of different penetrants will be carried out. The compounding technology and orthogonal experimental design will also be adopted for the further advancement. Finally the most effective combination of penetrants with its appropriate concentration will be demonstrated in the paper.