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The mechanical and physical properties of structural materials in fission/fussion system could be changed under the energetic particle irradiation.These effects are due to microstructural changes that arise from the production of radiation damage.It is important to explore the surface damage for surface modification to enhance material properties.In this talk,we will present extensive simulation results of primary surface damage in iron induced by energetic iron particles based on molecular dynamics method.We simulated the radiation of Fe(100)and Fe(110)surfaces with the ions energies of 1KeV,5KeV and 10KeV for each surface.It is found that,the size and amount of stable vacancy and interstitial defects increased with the energies of the primary knock atom(PKA).The number of stable vacancies exceeds the number of interstitials as the faster self-interstitial clusters can escape to the surfaces.Moreover,the <100> vacancy loop have high probability to appear beneath the Fe(110)surface.These results reveal that the irradiation damage varies with different Fe surface and may be helpul to improve the radiation resistance of structure materials through surface modification.