The 316L type austenitic stainless steel as main structural materials,are widely used for the fission reactors for more than 30 years.Besides,316L steel has been chosen as primary structural material for future advanced nuclear facility,such as fusion reactor and Accelerator Driven Subcritical(ADS)system[1].In this work,one set of the 316L steel specimens were irradiated with H and Heions to the doses of 1.01017 and 1.01018ioncm