The change of aquifer structure under mining condition has a significantt impact on the groundwater flow field and the distribution of groundwater resources.Taking Liyuanhe coal mine as an example, based on the analysis of hydrogeological conditions in the study area, combined with the damage degree of mining fissures to aquifer structure, this paper uses numerical simulation method to predict and analyze the dynamic characteristics of groundwater flow field in different aquifers in the study area after 20 years of mining.The results show that: The flow field of unconsolidated rock pore aquifer remains basically unchanged, only the groundwater level in the north of the mine field decreases, and a depression funnel is formed locally with a maximum depth of 18m;The clastic rock fractured aquifer is affected by the drainage of the mine, the groundwater level is greatly reduced, and the groundwater flow field changes significantly, forming a falling funnel centered at the middle of the mine field, with a maximum depth of 106m.