Reinforcing bar corrosion by salt injury (or salt damage) is a most serious problem that threatens the durability and strength of a concrete structure. It was clarified that the half-cell potential could be influenced by some properties of cover concrete, and a half-cell potential correction procedure taking the properties of cover concrete into account was proposed. Then, to suppress the reinforcing bar corrosion caused by salt injury, an anion adsorbent was chemically synthesized which could adsorb excess amounts of chlorine ions, releasing nitrous ions at the same time. Using materials containing this adsorbent, we propose a new repair method named Suppressing Salt Injury method (SSI method).