Chloride diffusion process on concrete is closely related to the factors such as environment condition and performance of concrete.This paper examines the effect of five exposure temperatures from 2 ℃ to 40 ℃ and curing age of 28，56 and 90 days on chloride diffusion in ordinary concrete and high-performance concrete.The result indicates that chloride diffusion on concrete increases with the exposure temperature.The degree of influence and activation energy Ea for the exposure temperature is related to the concrete performance and curing age.For the design and construction of concrete structure’s durability under different environmental regions，we should give full consideration to differences of concrete material and curing time on the values of activation energy Ea.