Abstract: Using orthogonal experimental design,adopts alkali extraction and sulfonation two step methods to produce humic acid CWS dispersants from peat,obtained better process parameters. In the alkali process extraction,the solid- liquid mass ratio is 1∶ 12,reaction temperature is 100℃,NaOH solution concentration is 2% and reaction time is 2 hours; In humic acid sulfonation process,the NaSO₃ dosage is 2. 4 g,sulfonation temperature is 40℃ and sulfonation time is 80 min. under above process conditions,19. 074 5 g humic acid CWS dispersant can be produced from 50 g peat. Using this kind of dispersant preparing CWS from Shenmu coal,when the CWS mass concentration is 60%,The dosage is 1%,and the CWS apparent viscosity is 602. 1 mPa·s。