Abstract: Based on the study of coal property measurement results of 136 samples from coal field exploration,the sulfur content and its forming mechanism in the recoverable coal seams in south-eastern wing of Dafang anticline are analyzed. The results show that the change of sulfur content is greater in south-eastern wing of Dafang anticline,ranging from low sulfur content coal to high sulfur content coal.Generally the coal in upper and middle section is of high sulfur content,the coal from mid to lower section is of lower sulfur content,but in under section the sulfur content is varied ranging from very low to very high.It is indicated that the coal's sulfur content in upper part of Longtan Formation is related to sulfur origin and depositional environment,but the sulfur content of coal in lower part of the Formation is related to sulfur original source and to lithologic properties of deposition basement,namely in the interval occurring tuff and basaltic,sulfur content of coal is low,otherwise is high.