Abstract: The development status of the overseas and domestic regional cathodic protection technique is introduced in detail, and five kinds of tank bottom cathodic protection technique are evaluated, indicating the existent question and development direction on tank bottom cathodic protection potential monitoring technique and protection effect evaluation technique. In addition, the research method on the steady distribution cathodic protection system is also introduced, in allusion to the prevenient default in cathodic protection numerical simulation. The paper puts forward a new calculation procedure of solving protection potential based on one typical current density distribution hypothesis.