Graphite, stainless steel and brass were selected as electrode materials in the chloride migration test. The diffusion coefficients were calculated from the steady state of chloride flux by the Nernst-Planck equation. X-ray diffraction was used to characterise the corrosion products in the chloride migration tests. The results show that the types of electrodes have significant effects on the diffusion coefficient calculated from the migration test. The diffusion coefficient may trend closely to the real value when graphite electrodes are used. Graphite is a suitable electrode material used in the chloride migration test.