Based on Yongcheng mining area hydrogeological conditions, using rich water coefficient method and “virtual large diameter well” method, combing measured data ,the mine inflow of each mining had been analyzed and calculated, the water quality also had been evaluated in order to demonstration the reliability and feasibility as the process water of power plant. The results show that 917 m3/h water quantity could be used for plant, but the water quality indicators are not reaching standard, and need furthermore treatment on water quality in order to meet the requirements of process water.