Abstract: Taking the high-arsenic coal in Hebei province as research object,carried out the leaching experiments.Investigate the effect of coal particle size,acid rain acidity,rainfall and acid rain type on the law of arsenic leaching out of the raw coal.The results show that,the leaching rate is high at the beginning of experiment,then gradually decrease.The arsenic exists mainly in the form of sulfide bound.The soluble arsenic,organic arsenic,residual fraction arsenic speciation in coal samples is few.In the leaching process,the soluble arsenic easily leach out,few sulfide bound arsenic dissolve in acid rain.The overall results show that,though the coal sample is high-arsenic one,it brings no contamination to environment during transport and storage under acid rain condition.