The contents of harmful trace elements including Cd,Cr and Tl of coal in the 9^#coal of Pingshuo mining area,are determined by ICP-MS.The planar distribution map of Cd,Cr and Tl elements of the mining area is generated by suffer software.The results show that the average content of Cd,Cr and Tl elements in the 9^#coal of Pingshuo mining area are 0.15μg/g、17.39μg/g and 0.12μg/g.The average content of Cd and Tl elements in the 9^#coal of Pingshuo mining area is lower than North China's,the whole China's and America's,while the average content of Cr elements in the 9^#coal of Pingshuo mining area is higher than North China's,the whole China's and America's.Their concentration factor,EF₁ are 0.75、0.17 and 0.28,and EF₂ are 2.8、0.65and 0.01.Cd and Tl are mainly in iron pyrite,while Cr is mainly in iron pyrite and clay pits.