Abstract: According to the problem of comprehensive utilization of water resources in Huaibei mining subsidence area. The paper studied the water supply and savin g condition in the area and analyzed the plain reservoir construction feasibility in this area.Results showed this area was coal seam mining and accumulated large mining t hickness,thus causing significant surface subsidence.Meanwhile,the good landscape,quaternary hydrogeological conditions and subsidence basin could provid favourable water storage space for rain and flood resources.What's more,due to the higher shallow groundwater level and larger mining subsidence ,shallow groundwater resources in dry season would flow to supply the subsidence area. Thus,the subsidence area formed stable water zone. The rain and flood resources,shallow groundwater and the integ ration of adjacent natural water system could be the stable reservoir supply source.Favorable hydrological condition and proper environmental protection measures could e ffectively control the reservoir water quality.Good construction conditions of plain reservoir made the water resources obtain effective protection and utilization and greatly promoted the regional economic development.