Abstract: The single-layer insulation pipelines are widely applied in Bohai Oil & Gas Field due to advantages of low costand quick installation. Some single-layer insulation pipelines, after being put into operation, were seriously corroded withina short time, which brought risks to the operation of pipeline. Herein, the structure and characteristics of the single-layerinsulation pipeline, as well as its application in Bohai were introduced, and based on the corrosion problems of the severalsingle-layer insulation pipelines of Bohai Oil & Gas Field found during inline inspection, the typical characteristics and rulesof corrosion of the single-layer insulation pipeline were analyzed. Moreover, discussion was carried out in terms of pipelinedesign, prefabrication and installation, as well as its operation management, quality control and corrosion mechanism, andthe causes accelerating corrosion of single-layer insulation pipeline were explained. Finally, suggestions were put forwardto adopt the new field joint coating technique, strengthen construction quality control, establish the perfect corrosionmonitoring and regular pigging mechanism, strengthen the real-time monitoring of pipeline condition and implementintegrity management of pipeline in its full life cycle to ensure the safety of oil and gas field production and operation.