Abstract: The double row pile support structure has the characteristics of short construction period,small construction area and large supporting depth,so it is widely used.Because the stress is relatively complex of structural system,design and calculation theory is not very mature,some problems have been found in engineering practice,so it is necessary to conduct the thorough research to the design parameters of double row piles and to explore effective improvement method.In this paper,the finite difference software FLAC 3Dis used to set up the numerical analysis model to study its force and deformation distribution law,and then proposed the optimization and improvement measures for the support structure.