On-site corrosion sensor was developed to monitor the adverse effects in the chloride – contaminated concrete structures. Galvano-static Pulse Technique(GPT) was applied to measure the polarization resistance of the anodes and the electrical resistance of the surrounded concrete using the sensor. This paper presents the analysis of GPT measurements performed in the chloride-contaminated concrete for the laboratory tests. The relationship between the corrosion rate of steel electrodes and surrounded concrete resistance measured by corrosion sensor confirms the reliability of developed corrosion sensor. The results further show that the concrete resistance is also an indicative parameter which is related to the corrosion state of concrete structures.