In general, Rg Value, Y value and holiday density can be used to evaluate the performance of the coating deposited on the buried steel pipelines. However, the evaluation may be misleading when a single parameter is used. A new combination method for assessing the performance of the coating on the steel pipelines is developed in this paper. Using this approach, Rg Value, Y value and holiday density play appropriate role on the assessment. Some new modules are presented in this approach, including current distributary module, holiday module, intelligent critical curve of AC attenuation. Additionally, a computer program is compiled that can finish data processing of AC attenuation automatic, and the result report can be synchronously printed.

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