Abstract: In order to solve the issue of pipe and flange burst caused by water during the deep processing of coal tar,the effects of dehydration reagent ratio,dosage,dehydration temperature and stirring time on dehydration efficiency were investigated. The dehydrating reagent could reduce the water content of coal tar to below 3%.The optimum conditions are I and J mixture ratio of 2 ∶ 3,the amount of dehydrating agent is 5×10~(-4),the dehydration temperature is 60 ℃ and the stirring time is 1 h.The test results show that the dehydrating reagent has little effect on the quality of coal tar,moreover,it has good dewatering and desalting capacity.