Abstract: The coal gangue in Xinzhou mine of Datong Coal Mine Group is used as the research object.The migration of polycyclic aromatic hydrocarbons(PAHs) is studied by dynamic leaching device in the process of refactoring soil using coal gangue.The content of PAHs in coal gangue is measured by chemical detection method, so as to find the migration characteristics after filling soil of it.The results show that the PAHs containing in coal gangue are gradually transferred to the surrounding soil with the increase of burial time and covering depth under the leaching effect of rain water, and the migration amount are medium molecular weight substances< small molecular weight substances< high molecular weight substances.The influence of burial time on PAHs migration is better than the depth of soil.The maximum relative error between simulation results and actual results is 8.8% in buried 50 cm after 4 years of overburden, the results show that the reliability of dynamic eluviation simulator is higher.