This paper studies the protection current distribution of impressed current cathodic protection (ICCP) for chloride contaminated reinforced concrete in the atmosphere zone. It seeks to master the main technical parameters of ICCP and applied to practical engineering. The layers and spacing of electrical connection steel rebar effect on the current distribution have studied in this paper. The results indicate that for the ICCP system which is applied to the chloride contaminated concrete of atmosphere zone, the first and second layers of reinforcement adjacent to the auxiliary anode absorbe more than 70% of total current, and their spacing has a great impact on the current dispersion in the steel reinforced bars.