When using traditional m method to calculate the internal force of single anchor T type underground continuous wall,the soil reaction force in front of wall tends to exceed the passive earth pressure.Therefore,several times of iterative computation are required to constantly adjust the value m of soil until it meets the requirements,and the process of calculation is cumbersome.Combined with practical work,based on the traditional m method,this paper considers the effect of soil deformation on the value m,and the segmentation m method is proposed to calculate the T type underground continuous wall.It has effectively solved the problem of traditional m method in calculation，and has been successfully applied in engineering design of general cargo terminal in Caofeidian port area of Tangshan port.