Abstarct: Excavation underground spaces in soils and shallow depths create horizontal and vertical displacement around the underground space. These displacements can shift to surface and cause damage to the Surface structures and their supporting foundations. Studying changes resulting from the passage of tunnel as on of conventional urban underground spaces on the stability of deep foundations is very important. In this study, the effect of tunneling on stability of adjasent piles by carrying finite different analysis with 〖FLAC〗^3D, During the case study of piles of the bridge in intersection of Emam Ali-Shahid Mahalati highways in the presence of line seven Tehran metro, studied. The main parameters discussed in this study consisted of pile lengh, pile lateral distance from center of tunnel and tunnel depth. In this study, the effect of the above-mentioned parameters on lateral deformation, settlement of piles, changes of axial forces in piles toe, changes shaft pile strength and bearing capacity of the piles in presence of tunneling in different depth must be evaluated. The results of analysis, indicated that four influence zone formed around tunnel. Piles that their toe is located in first zone that is located above the tunnel and in a lateral distance equal to 0/6 tunnel diameter (D_T) From center of tunnel and as much as three 3D_T to the surface Extended, compared to the absence of tunnel Showing the biggest drop (%33.1) in reducing pile axial bearing capacity, so this area can be introduced as critical zone of tunneling effect on adjacent piles. Tunneling on Piles that their toe is located in fourth zone which is projected at an angle of 45 from tunnel springline and in lateral distance of [X]>2.1D_T Extended it has nor any effect.