Based on the transfer matrix method of vertical elastic foundation beam,the sheet-pile wall and the corresponding soil layer are divided into thinner soil layers in the same kind of soil,and a fixed point iterative formula of solving m value is established.According to the results of horizontal deformation field measurements of three typical sheet pile wall projects in the lower Yangtze River region,the ranges of m value for the silty clay and slit sand are presented by the inversion method.The inversion analyses of m value can well reflect the actual situation,and the results indicate that the m value will rise with the increase of depth and then tends to be stable.For the similar project in the lower Yangtze River region,the inversion results show that the recommended ranges of m value for the silty clay and slit sand for the large deformation of sheet-pile are 2 700～3 400 kN/m4 and 2 000～2 800 kN/m4 respectively,and it can provide a reliable basis for selection of m value in the similar region.