Different dry wet cycle system for analyzing the transport characteristics of the chloride ion in concrete was designed. Eight kinds of cyclic erosion system was also designed，then the influences of different cyclic conditions on the transport depth of chloride ion, the distribution of chloride ion concentration, surface chloride ion concentration, chloride ion diffusion coefficient, convection zone and chloride ion transport efficiency in concrete were investigated. The following conclusions are drawn from the test results：the acceleration effect of wet and dry cycles on the chloride ion transportation is limited to a certain extent; for the different wet and dry systems, the chloride ion concentration increases with the increase of dry wet ratio; the appearance of the convection zone in concrete under wet and dry cycles show time dependent; with the increase of the cycle period, convection peak gradually increases in the form of power function, and the increase of the dry wet ratio is conducive to the accumulation of peak concentration; in the same period of the cycle, when dry wet ratio is 5∶1 the highest transport efficiency of the chloride ion in concrete is achieved.