The critical chloride ions concentration of pitting corrosion and pitting corrosion rate of domestic rebar,anode ladders sensor rebar,and ECI-2 sensor rebar are investigated by potentiodynamic polarization and liner polarization respectively. The results show that the domestic rebar and ECI-2 sensor rebar have a similar critical chloride ions concentration of pitting corrosion and different pitting corrosion rates. However,the critical chloride ions concentration of pitting corrosion and pitting corrosion rate for the anode ladders sensor rebar are different from that of domestic rebar. Therefore,the monitoring results for the two sensors should be modified when they are used in domestic engineering to monitor its durability.