Abstract: Two hundred and ninety coal samples taken from twenty-six provinces are tested and analysed for their organic sulphur contents.The test results indicated that:the main range of organic sulphur quality fraction in Chinese coals is about 0~1.0%;the organic sulfur is dominant in the coals which characterized by low total sulfur contents,but the inorganic sulfur is dominating in the coals with high total sulfur contents;in Guangxi Province,Hunan Province etc,the organic sulfur is primary in coals which with moderate and high sulfur contents.In all of tested samples,the coals with high organic sulfur contents are distributed in two big coal-cumulating areas:the southern China and northern China,where the coal are mostly Carboniferous and Permian coals.The organic sulfur contents are irrelevant with coal ranks.The coals with high organic sulfur contents are caused by the seawater influence during the coal-generation time.