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The radiation damages had been performed for Chinese Spallation Neutron Source(CSNS)target components that relies on Monte Carlo simulation code MCNPX2.5.0.During the calculation,Bertini intra-nuclear cascade model,three level-density formulation GCCI,and the multistage pre-equilibrium model MPM on which are provided within MNCPX were employed.We also compared the effects on the radiation damage due to two different physics models and the proton beam profiles.Based on these results and the allowable DPA values we had estimated the lifetime of the tungsten target and its vessel.