In response to the problem of soil pressure distribution behind the newly built sheet pile wall in the upgrading and renovation of gravity walls，the paper studies the distribution law of soil pressure at different distances between the newly built sheet pile wall and the existing gravity wall.Finite element numerical simulation and theoretical formula calculation are used to compare and analyze the distribution of soil pressure.It is concluded that the soil pressure acting on the front sheet pile wall is less than the theoretical active soil pressure，indicating there is a silo effect.It is suggested that when the front sheet pile wall is installed in the gravity wharf reconstruction project，the size of the silo should be rationally selected by the formula，or the soil pressure exerted on the sheet pile wall should be calculated by the finite element method according to the distance between the newly built sheet pile wall and the existing wharf wall，to avoid conservative or radical design.