Abstract: By the analysis and study of δ¹³C and δ¹⁸O values attained from the brachiopod fossils of Late Paleozoic coal bearing strata in East hill of Taiyuan,the relationship between δ¹³C value of brachiopod and Z value （relative paleosalinity） is revealed.The δ¹³C and Z values,as the environment parameters,are conformed with the existing condition of medium which is interpreted qualitatively by the corresponding brachiopod community,thus,the importance of brachiopod community analysis is increased greatly.The further ecological research on the brachiopod community regionally is of very important for the analysis of coal accumulating basin history.