The influences of the addition of ground limestone,fly ash and the mixed addition of ground limestone and fly ash on the chloride diffusivities of the high strength concrete are studied by using NT BUILD 492 method.The experimental results indicated that the 28 d strength and the resistance to chloride permeability of concrete decrease with increasing the content of the ground limestone.The resistance to chloride permeability and 28 d compressive strength of concrete with ground limestone could be effectively improved by the addition of fly ash.