Abstract: Utilizing the theory of J integration in fracture mechanics, derived an elastic evaluation equation and a depression of failure evaluation curve of the pipeline with cracking. And evaluated pressure bearing capability on the pipeline with surface cracking. This method was used to evaluate the pressure bearing capability on Lunku Oil Transport Pipeline, a result obtained was identical with field test data and showed no difference with a conclusion to the pipeline analysis made by American ANOCO. It stated that the evaluation method is correct and has a popularied application value.