Abstract: This paper gives an overview of manufacturing high-strength grade X80 line pipe, discusses design aspects including fracture inition, arrest and weld strength mismatch. It showes that the development trend of pipeline is high strength and high toughness. The paper introduces the actual quality level of oversea X80 line pipe with example of Ruhrgas pipeline, including alloying, control roll and control cooling process, and discusses the fracture propagation and arrest in pipeline, and weldability of high-strength line pipe.