Abstract: The water inflow calculation of foundation pit under the condition of bottom-type waterproof curtain is a technical problem to be solved because of the existence of leakage point.Aiming at the uncertainty of groundwater seepage in bottom-falling foundation pit,the hydrogeological model for dewatering of partially penetrating wells of bottom-type foundation pit in artesian aquifer is established.Based on the Theis theory of unsteady flow of partially penetrating wells and the mirror method,the calculation formula of equivalent permeability coefficient is deduced,and the leakage coefficient method is proposed to evaluate the effect of waterproof curtain and to calculate the water inflow of foundation pit.Finally,taking a deep foundation pit dewatering project in Wuhan as an example,the water inflow of the foundation pit is calculated by using the leakage coefficient method,and compared with the measured results and the calculation results of the traditional method.The comparison results show that the calculation error of the leakage coefficient method is slight,and the calculation process is simple.The research results can be used to guide engineering design,and have certain practical application value.