Abstract: The optimum condition was determined for organic sulfur removal from coal by copper chloride oxidation and tetrachloroethylene extration through orthogonal testing. The effect of desulfurization conditions on organic sulfur removal was studied. At the same time, the influence of this desulfurization method on the quality of coal was inquired into. The results showed that this method was good and reaction condition was very mild. And the best desulfurization condition was that PCE as organic solvent, the size of coal was 0.076 mm, the concentration of coal was 0.067 g/mL, reaction time was 120 min and reaction temperature was 120 ℃. Under this condition, the highest organic sulfur removal reached 43%. It was obvious that the organic sulfur removal increased with the decrease in size of coal and it increased at first, and then changed little, even decreased with increasing reaction time, temperature and concentration of coal. The analysis of IR spectrum showed that the structure of coal wasn't destroyed. The loss of heating value of coal was less.