Abstract: The SEM,EDS,and WDS are used for the organic sulfur（S_o） determination in coal. 1.In low sulfur coals,while S_o content is less than 0.50%,S_o content of inertinite is similar to that of vitrinite.However,in the coals,whost S_o is more than 0.50%,the S_o of inertinite is mostly 40%~50% of that of vitrinite.S_o content incresses with their gelification degree.Meanwhile, sporinite,cutinite and alginite contain S_o more than vitrinite. 2.The palaeogeographic environment of coal accumulation evidently influence on S_o content in coal.The vitrinite of Shen-Mo coal,which accumulated in lacustrine delta plain,contain 0.21% S_o,the vitrinite in Shui-Cheng coal,which accumulated in coastal delta plain,contain 0.84% S_o,in Yan-Zhou coal,which is borne in paralic,sequence is so high as 2.24%.