Groundwater recharge is often employed to reduce the adverse effects of dewatering on geological environment surrounding during the construction of deep foundation pit. However, the design theory of dewateringrecharge is still in exploratory stage. In this paper, twodimensional potential function theory and superposition principle are introduced to solve the equation of saturation curve under the combined action of dewatering and recharge of diving well and confined well without waterproof curtain. In addition, the influence of dewatering in foundation pit and groundwater recharge outside foundation pit on groundwater level outside foundation pit is obtained by space confluence point principle and mirror image principle, and the analytical expression of groundwater saturation curve under dewateringrecharge in foundation pit with waterproof curtain is obtained by superposition principle. In this paper, the influence of the main factors is discussed, such as the distance between the recharge well and the waterproof curtain of foundation pit and the permeability coefficient on the saturation curve under the condition of the waterproof curtain, which provides a reference for the dewateringrecharge design of foundation pit.