Abstract: This paper tries to model different pile types, different pile spacing and different soil porosities in the simulation to analyze different bearing capacities of soil arching and reveals the formation, development and destruction of the soil arching by staining particles of different displacements in the model. Through a comparison of a series of numerical simulations, the authors have found that the rectangle pile creates much more bearing capacity than the circle pile and when the pile spacing is 4.6D, the bearing capacity of soil arching will attain the limitation. After that, the soil arching effect will gradually disappear. Within a certain range, the higher the porosity is, the more obvious the soil arching effect in the sand will show, and the embedding depth of the pile with the soil below the sliding surface affects the bearing capacity of soil arching simultaneously. From the micro-analysis the authors have reached the conclusion that only when the displacement and length of pile ratio are in the range of 0.2-0.8 can the soil arching play a role.