The alumina coatings as a tritium-resistance coating were deposited on 316L stainless steel by ion implantation. The effects of different parameters of ion implantation process on the wear resistance, corrosion resistance, thermal shock resistance, and tritium permeation resistance of α-Al₂O₃ were investigated. Results show that the content of α-Al₂O₃ is affected by temperature, acceleration voltage, and ion implantation dose. With increasing the temperature, the content of α-Al₂O₃ is increased. With increasing the acceleration voltage or ion implantation dose, the content of α-Al₂O₃ is firstly increased and then decreased. The wear resistance and corrosion resistance are mainly affected by the ion implantation dose: with increasing the ion implantation dose, the wear and corrosion resistance becomes better. The Al₂O₃ coatings hardly changes after 200 times of thermal shock tests, indicating a good thermal shock resistance. The tritium permeability of the coated specimen is reduced by 3 orders of magnitude, compared with that of the 316L stainless steel bulk.