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The diffusion properties of free chloride and total chloride in concrete with different water-binder ratio and different volume of fly ash were studied by natural diffusion method in our laboratory.The results show that,both the relationship between free chloride and total chloride content and the relationship between free chloride diffusion coefficient and total chloride diffusion coefficient are linear.The coefficient between free chloride and total chloride content decreases with the increase of water-binder ratio or with the increase of volume of fly ash when the volume of fly ash is not high than 30%.There is also a linear relationship between attenuation index of chloride diffusion coefficient and volume of fly ash.