Abstract: In the anthracite of Laochang mining area in Late Permian coal field in eastem Yunnan,the content of arsenic ranges in 0.1×10^-6~86.2×10^-6,averaging 6.2×10^-6,being 3.4 times to the regional background value.The distribution of arsenic in coal has two genetic types:that is,terrigenous sediment and addition of epigenetic mineralization,and the arsenic abundance in the later is higher obviously than that in the former.Through the flotation test,the occurrence form,main carrier mineral and arsenic abundance in both types of coal are analyzed and calculated.Based on the measured data,the washability and volatile property in coal combustion of arsenic are evaluated.