Abstract: In order to understand the influence of lignosulfonates dispersant ( LS) on the slurry ability of coal slime, the adsorption mechanism of LS in coal slime s urface was carried out through static adsorption experiments and the adsorption curves were analyzed by kinetic equations and isothermal adsorption models. The resu Its showed that the initial concentration of LS had notable effects on adsorption. The best absorption effect could be obtained while the initial concentration of LS was 0. 4 gI L. Meanwhile, the adsorption capacity increased with temperature at the same concentration of LS. Adsorption process fit well pseudo second order kinetics equati on and the adsorption rate of LS on the coal slime was controlled by the combination of surface diffusion and intraparticle diffusion. The adsorption behaviors well accor ded with the Langmuir and Freundlich isotherm equation. The thermodynamic parameters calculation results indicated that LS spontaneously adsorb on the coal slime t 0 increase the surface wetting properties of coal slime as well as the stability of coal slime water mixture by hydrogen bond and static electricity functions.