Factors such as current intensity impose, anode materials and electrode auxiliary substances affect to the protective effect for carbon steel cathodic in the soil by external current impose. When increasing current intensity impose from 0.14; 0.5 and 1 mA, the protective cathodic effect increased, however, for the system by current impose 0.14 mA, after 96 hours of protection. voltage of carbon steel cathodic is -1.27 V/Cu/CuSO4 and in the range of voltage protection standard (-0.85 to -1.45 V/Cu/CuSO4). Effeciency of the cathodic protective system increases when using PbO2/304 stainless anode PbO2- TiO2/304 stainless nanocomposit PbO2- TiO2/304 stainless composit. Electrode auxiliary substances on the basis of 65 percent benton it + 6 percent carbon powder + 29 percent H2O reduced the effective protection of cathode.