To further study the horizontal cumulative deformation characteristics of pile group foundation,as well as the variation patterns under the influence of factors such as the pile itself,load factors and soil around piles,this paper combines the implementation process of USDFLD subroutine and ABAQUS three-dimensional modeling process to study the cumulative deformation characteristics of pile groups using finite element calculation results.By changing parameters such as pile distance,pile number,load incidence angle,loading frequency,initial elastic modulus of soil,pile-soil interface friction coefficient and other parameters,the horizontal cumulative deformation characteristics of pile groups are further studied,and the variation rules under the influence of factors such as pile itself,load factor and soil around pile.The effect of soil weakening around piles on the cumulative deformation characteristics of pile group foundation is often ignored in numerical simulation.Therefore,this article also studies how to achieve soil softening in numerical model.Finally,the horizontal cumulative deformation characteristics of pile groups and the variation rules under various influencing factors are obtained.For example,under the influence of pile body itself,the horizontal cumulative deformation of pile caps decreases with the increase of pile distance and pile number,the load-displacement hystericity ring becomes fuller with the decrease of pile number,and the soil nonlinearity becomes more obvious.