In this paper, the model of ions migration in concrete has established under the electric field. Na+, Cl- ions migration law was analyzed theoretically during the process of electrochemical chloride extraction(ECE) based on the experimental parameters, empirical constants and suitable boundary conditions. The content of Na+ and Cl- ions in concrete after ECE is agree with simulating results, which shows the model of this paper is effective and reasonable. Both experimental results and simulating results indicate that distribution profile of Cl- ions in the radial direction is the convex curve under electric field, and with the max value of Cl- content appears at a certain position in concrete. With growth of the treatment time, both Cl- ions content in concrete and extracted rate of Cl- ions decline, while Na+ ions gradually aggregates close to reinforcement.
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