Applied voltage methods are used to accelerate the migration of chloride ions and to shorten the testing time. This paperreviewed the influence of factors on the chloride ion migration characteristicsin an electrical field, and the effect of applied voltage onthe chloride binding-desorption, pore structure and hydration products. The applied voltage has a slight effect on the unsteadyelectro-migration coefficient. Chloride ion concentration mainly affects the steady state migration coefficient. The use of mineraladmixture can reduce the difference between chloride diffusion coefficients obtained bydifferent test methods underapplied voltage,especially the use of silica fume. The effect of applied voltage on the chloride ion binding is varying under different test conditions.The reverse voltage canprompt the desorption of combined chloride ions, which has an effect on the refinement of pore structure ofbelow 200 nm, decomposition of C-S-H and formation of Friedel’s salt.