Abstract: Aquifer parameters in pumping tests usually are obtained by the Theis formula or the graphical methods induced by formula.But all these methods didn′t take the boundary conditions and the influences of pumping wells between each other into account.According to this situation，based on leakage recharge boundary and superposition principle，calculation formula of permeability coefficient in pumping test of group holes with leakage recharge boundary was proposed.It was verified in pumping test in the eastern diggings of an in-situ leaching mine.The permeability coefficient of this aquifer was calculated as 5.1 m/d by using the formula，which was used to propose the function relation between radium and drawdown in constant flow pumping test.The calculated value and observed value are basically the same with the error between 0.7% and 6%，which verifies the feasibility of the formula.It is proposed that the optimal radium varies from 0.2 m to 0.3 m，which provides reference to the construction of the mine.

Key words: Leakage recharge, Pumping test, Permeability coefficient, Radium, Drawdown