Abstract: In order to study the influence of electrolytic desulfurization on coal properties under HCl electrolyte condition,taking raw coal and coal samples after desulfurization as research objects,the changes of minerals composition,element content,pyrite distribution,surface oxygen groups were analyzed by SEM,XRF,XRD,FT- IR. The results showed that,when the concentration of electrolyte HCl was 0. 75 mol / L,the current density was 0. 044 A / cm2,the coal slurry mass concentration was 0. 02 g/m L,the coal particle size was below 0. 5 mm,the electrochemical desulfurization method basically realized inorganic and organic sulfur simultaneous removal. The removal rate of total sulfur,organic sulfur and inorganic sulfur could reach 76. 32%,62. 32% and 82. 80%. The ash of clean coal decreased by 9. 38%,and the calorific value of clean coal increased by 0. 70 MJ / kg,so the electrochemical desulfurization method improved the coal properties without destroying original coal structure.