Abstract：Under the condition of non-stationary stochastic earthquake motion process，the numerical models of seismic responses of submerged tunnels are utilized to study the non-stationary stochastic seismic responses and the dynamic reliability of resistance of tunnels to longitudinal earthquake. Based on the basic principles of finite element dynamical analysis，an analysis method of the longitudinal non-stationary stochastic seismic responses and the aseismic reliability of tunnels is studied，and the evaluation formulas are derived for these purposes by using the impulse-response function and the principles of Fourier transform and theories of random vibration. The Nanjing Changjiang Tunnel is used as an example to compute the root-mean-square responses，the longitudinal aseismic reliability under non-stationary random earthquake loads and the reliability of earthquake resistance of its joint.
