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In order to develop UNDEX shock resistance flatform, it was predesigned that the isolation system and two hull structure. Used the finite element analysis software ABAQUS to simulate the impulsion response of the flatform subjected to the explosion loading before and after vibration, predict of the anti-shock vibration isolation performance of flatform. This paper adopts acoustic structure coupling method, considering the influence of cavitation effects and material strain rate strengthen effect. Simulation results show that: the plastic deformation of hull bottom is significantly reduced and vertical acceleration peak decrement of hull above 95% in UNDEX via adopting the strengthen hull structure. The result of offshore explosion test verifies that the coincidence numerical simulations with test value is good, the simulation design is rational.