Abstract: An experimental study in oxidation corrosion of radiolysis products from irradiated graniticgroundwater on metal material of high-level waste container in the simulated condition of deep ge-ological disposal (t=190℃, p=20MPa, pH=7. 2) is done by means of ~(60)Co gamma irradia-tion source, artificial simulated granitic groundwater, high temperature and high pressure experi-mental installation. Contrasting with that in the condition of no irradiation, oxidation corrosionintensity of groundwater radiolysis products on various metal material increases: copper——1. 5times aluminium——2. 8 times, iron——4. 3 times stainless stell——0.7 time. Damage ofgroundwater radiolysis products to various engineering barriers of radwaste disposal repositoryshould be pay attention to when our country selects metal material of high-level waste container,designes container style and deep geological disposal repository.