In order to ascertain the hydrogeological condition of Ordovician limestone aquifer in Dashucun mine and prevent occurrence of Ordovician limestone water inrush accidents, water flow test was conducted in the west wing of mine.?The initial flow rate of water discharge test and the method of unsteady flow were adopted to satisfy parametric requirements of unsteady flow Theis formula. The hydrogeological parameters were calculated by linear graphic method and water level recovery method respectively. The practice showed that guidance water coefficient and water storage coefficient obtained by linear graphic method were suitable for evaluating aquifer, which could meet the requirement of mine water inflow.