In this study, statistical analysis and numerical simulation based on Shanghai and Suzhou soft ground pit data is used to analyze the laws of maximum deflection of the diaphragm wall, maximum ground settlement, and their relationship. The results show that the deformation characteristics of pits are different in the two regions, and the deformation of pits in Shanghai is greater. The maximum deflection of the diaphragm wall ranges from 0.066 to 0.960 %H, and the average value is 0.364 %H in Shanghai. In Suzhou, maximum deflection ranges from 0.05 to 0.30 %H, and the average value is 0.16 %H. The maximum ground settlement in Shanghai spans from 0.079 to 0.510 %H, the average value is 0.248 %H, and it ranges from 0.03 to 0.168 %H. Meanwhile, the average value was 0.089 %H in Suzhou. These results provide a useful reference for the design and construction of excavation projects in both regions.