Abstract: In order to monitor, prevent and control the corrosion in in-service product pipelines, the value of the first-run inline inspection data was further mined, and the analysis idea was proposed in such a way that, the internal corrosion sensitive area should be semi-quantitatively located through differential analysis of the dispersion of the absolute depth of internal corrosion in the watershed region, combined with the relative positions between the internal corrosion and the pipe fittings such as welds, bends and the like, as well as the pipeline process operation data information. Taking one product pipeline as example, the corrosion conditions of two pipeline sections were analyzed, and it was found that the corrosion accumulation in the pipeline was formed by the gradual development of internal corrosion generated during the pipeline construction. The corrosion-sensitive pipeline sections with pipeline joints as basic units were located, and the in-line inspection data were suggested to be included in the key data of engineering construction quality evaluation. It is suggested that the newly-built pipeline should be pigged as soon as possible to facilitate in-line inspection, the pigging frequency should be increased, the rust in the pipeline should be removed earlier, and subsequently, routine pigging operations can be carried out to effectively slow down the development of internal corrosion.