Abstract: The important precondition on the coating's overhaul is to conduct a scientific discrimination to the abandoment of coating. On the basis of discriminatory method of coating's abandoment used in Linyi-Yizheng oil pipeline, it is points out that the comprehensive analysis on the insulation resistance data of coating, operating parameters of CP system, and leak detection and/or repair of coating should be made in order to determine the overhaul location of coating and improve the discriminatory accuracy of coating's abandoment.