According to the monitoring data mediator Nanjing Metro Line station,this paper analyzed the deformation characteristics of the underground continuous wall. It is found that the law of space effect is quite obvious during excavation retaining structure deformation; and the amount of land in the vicinity of the lateral wall of the base reaches a maximum with the increasing of excavation depth. It is also found that a wall changes similar parabola,the lateral displacement of the wall decreases with increasing of their stiffness and. Combined with plane finite element analysis software plaxis and HS wall deformation constitutive model,the main factors were analyzed. The analysis results suggest that,the thickness of its walls takes(2. 5% ~ 3. 5%) H when the Nanjing area of excavation depth is H.