The internal chloride expression method is used to estimate and simulate the chloride?induced corrosion to steel reinforced concrete, with experiment examples given. It can be gotton that the chloride expression method can save much time, avoid other factors except the chloride corrosion, and can exactly indicate the performance of different materials to resist the chloride corrosion, and that it is reasonable to simulate the chloride?induced corrosion to steel reinforced concrete with the internal chloride expression method.