The construction around the subway will cause large heaped load and result in longitudinal deformation of tunnel structure. First,the deep-lying shield tunnel is equivalent to the beam on double elastic foundation. Second,Boussinesq's formula was used to calculate the additional stress above the tunnel. Finally, the longitudinal displacement and internal force of tunnels was solved by use of finite difference method and Matlab, and was compared with the calculated values of model of elastic foundation beam.The result showed that the deformation and internal force of the beam on double elastic foundation are much smaller than those of the beam on elastic foundation. The conclusion can provide certain basis for the rational design of deep-lying shield tunnel .