Abstract: In order to study the influence of the parameters of strengthened soils in passive zone of excavations on the lateral displacement of supporting structures in soft soil ground, based on a typical excavation in Wuhan, a finite difference model is established by the FLAC two-dimensional numerical simulation method. Then, the calculated results of CX6 are compared with the field data to verify the rationality and accuracy of the numerical model. The distribution laws of stress on piles and lateral displacement of supporting structure at different measuring points are in consistency, which reflects the correctness of the measured data. The effects of the depth, width and shape in passive zone on the lateral deformation of the supporting structures are studied. The calculated results are compared with the field data to verify the rationality and accuracy of the numerical model. The better agreement of filed data and the numerical simulation analysis shows that the numerical simulation can be used to analyze the actual deformation laws of the supporting structure. The multi-stair improvement has obvious advantages in passive zone compared with other forms, and it shows great application value in Wuhan soft soil layer areas. The effects of strengthened soils in passive zone on the lateral deformation of the supporting structures are obvious. The effects of the depth and width in passive zone exist a valid range. When those parameters exceed a certain value, the increasing rate of the reinforcement effects will be very little. When the width and depth of the improvement are approximately equal, the optimum reinforcement effect can be obtained.