Using the remote sensing technology of geographic information,the paper simulated the evolution process of storage space at Zhu-Lu subsidence area from 1987 to 2013 . Based on the model of reservoir flood routing,it built the predict model of flood storage and flood detention of coal mining subsidence area and. simulated the process of different frequency flood and calculate the detention of flood in different level years in the future according to the prediction model.The result showed that the reduction volume of flood peaking of once in 5,10,20 and 50 years in 2015,2020 and 2030 can be cut from 0.7% to 41.4%.The result can provide reference for the establishment of policy and the comprehensive utilization and management of water resources in coal mining subsidence areas.