In this paper, the Youth Olympic Games in Nanjing underground traffic engineering tunnel axis of the main excavation pit asymmetric horizontal displacement monitoring data were taken as the basis for horizontal displacement monitoring. The numerical values of the ABAQUS simulation values were analyzed. It was concluded that Wall horizontal displacement occurs firstly at the top of the wall outward displacement of the cantilever excavation triangular distribution, and with the support of the erection, wall rotation occurs. The numerical simulations meet with actual monitored values; the pressure in the soil near the excavation face increases with increasing height of the wall. Above supporting section, the analog value is less than the calculated value; and in the following part of the excavation face, the analog value is greater than the calculated value; with the increasing depth of the excavation boom segment, the largest segment cantilever earth pressure is gradually increased, wall subsoil pressure value decreases.