Based on FLAC3D, the vertical and lateral bearing capacity and deformation characteristics of large diameter solid piles were numerically simulated.The mechanical mechanism, bearing capacity and deformation characteristics of large diameter solid pile are thoroughly and comprehensively studied, and the following conclusions are drawn ：In this simulation, the limit value of single pile bearing capacity of large diameter solid pile is 82000kN, the characteristic value of single pile bearing capacity is 41000kN, the limit value of horizontal bearing capacity is 1750kN, and the characteristic value of horizontal bearing capacity is 1000kN.With the increase of vertical displacement, the settlement of the soil around the pile decreases with the increase of the distance from the pile. Compared with the pile and the soil around the pile, the settlement of the soil around the pile tip is smaller, and the compression of the pile is larger during the loading process of the model.Under all levels of load, the pile axial force decreases with the increase of depth, and the pile axial force almost drops to zero at the pile tip.After the horizontal load is applied, the horizontal displacement of pile tip reaches the maximum. With the increase of pile burial depth, the pile displacement rapidly decreases to zero, and the pile bending moment increases first and then decreases to zero with the increase of pile burial depth.