This study represents the result of corrosion monitoring on reinforced concrete specimens by means of multi-functional corrosion monitoring sensors. To confirm the effectiveness of the sensors eight different kinds of condition were adopted. Test factors were corrosion potential current corrosion rate resistivity and temperature which were monitored with the sensors. Through this study judging corrosion of steel in concrete with single corrosion factor such as corrosion potential was difficult because many other factors can have an influence on the reaction of corrosion. By using three different kinds of sensors it could enhance the accuracy of corrosion monitoring.