Abstract: In order to get good performance and low cost dispersant of coal water slurry,taking Huolinhe weathered lignite as raw materials,sodium humate solution was obtained by extracting lignite with sodium hydroxide,the derived sodium humate solution was sulfomethylated to prepare LSHA dispersant. The optimum processing condition of direct sulfomethylation of sodium humate solution was determined by orthogonal method,The dispersant was used for the slurry performance test of the aft er-product of Baori lignite briquette ,and compared with the slurry performance of the commercially available naphthalene series dispersant. The results showed that the optimum conditions of the sulfomethylation were obtained as follows:the amount of Na_ 2SO_ 3 was 30%,the amount of HCHO was 40% ,the reaction temperature was 9 0°C,and the reaction time was 150 minutes.The maximum slurry concentration of coal water slurry prepared by LSHA dispersant was 59. 1% ,which was 0.8% lower than the water coal slurry prepared by naphthalene series ,satisfied the requirements of CWS gasification in terms of slurry concentration,and its stability was better than that of naphthalene series.