Abstract: For the multi-well system in the anti-uplifting system based on intercepting and discharging water, there is no practical simplified method except the numerical method for seepage analysis, which is not conducive to its application. In view of this, a simplified method is proposed. The idea is as follows: for the multi-well system with even distribution inside the circular cut-off wall, the hydraulic head on the inside boundary of the cut-off wall is assumed to be constant, and the distribution of the hydraulic head of the multi-well system is deduced through conformal mapping. For the non-circular cut-off wall, it can be equivalent to a circle to obtain an approximate solution.The resistance coefficient method is adopted to connect the inner and outer seepage fields of the cut-off wall in series on the basis of considering the water leakage and by-pass seepage of the cut-off wall, and the total flow can be obtained. After verification, a comparison with the finite element method shows that the difference between the simplified algorithm and the finite element method is smaller, and it only needs to provide a few geometric parameters to get more accurate results. The control of the hydraulic head at the bottom of the floor and the hydraulic slope around the well are the key points in the anti-uplifting design process based on drainage decompression. Moreover, in order to give consideration of both safety and economy, parameters n, r, h_w and r_w need to be adjusted repeatedly to achieve the best effect.