In shield tunneling approaching projects,the construction activities are of large risks for shield tunneling with an underground road overlapped on it. Considering the coupling deformation of tunnel and underground road,the analysis-calculation model of shield tunneling below an underground road is established with Finite-Difference-Method. Thus,soil movement and underground structure deformation can be acquired. The results show that soil movement appears mainly in three enveloped area. For underground road,the additional deformation is much heavier on the top plate and bottom plate above the tunnel crown. Moreover,the "horizontal egg" deformation of shield lining for three enveloped situation decreases compared with semi-infinite situation.