Abstract: Carbon fabric reinforced cementitious matrix (CFRCM) is often used in the reinforcement of concrete structures and the electrochemical protection of steel bars because of their combination of structural performance improvement and impressed current cathodic protection (ICCP). The effect and mechanism of CFRCM performance are less studied. It is found that the electrical conductivity and mechanical properties of CFRCM are degraded by ICCP through accelerated energization test and tensile test of CFRCM. With the increase of charge density, the damaged occurrence on the surface of carbon fiber is cracking, , peeling, and fracturing. The CFRCM resistance experienced two stages of slow growth and rapid growth, and when the charge density was the same, the resistance change was the same. The larger the charge, the more obvious the fiber fracture phenomenon, and the smaller the ultimate load during the CFRCM tensile process.