Abstract: During the construction of earthwork cofferdam seepage control wall, solid wall mud has certain seepage control function. If some emergencies occur in the project that seriously affect the construction progress, in order to ensure the construction progress of the main building, the project can use the construction strategy of pit pumping in advance during the construction of cofferdam impermeable wall. But at this time, the impermeability of the solid wall mud and the stability of the weir body to meet the requirements remain to be studied. In this paper, ABAQUS finite element calculation software is used to research the influence of depth of impermeable layer of cofferdam, mud permeability coefficient and mud influence zone on the seepage control ability of cofferdam by taking seepage volume as evaluation parameter. On this basis, the inversion method of mud permeability coefficient based on the seepage flow volume of cofferdam is proposed, which provides an important basis for the research on the construction strategy that the construction of cofferdam impermeable wall is carried out at the same time with the advance drainage of foundation pit. The research results can provide reference for similar projects.