Application of high-strength line pipe is beneficial for the reduction of cost of gas transmission pipelines by enabling high-pressure operation. Long-distance gas transmission pipelines from remote areas sometimes pass through discontinuous permafrost, and are subject to ground movement by repeated thaw subsidence and frost heave. In this case, high-deformable line pipe is required for strain-based design. On the other hand, in recent years, demand for high-strength line pipe steels has emerged in which the content of the alloying element is reduced because of the high cost of alloying elements. This paper describes the metallurgical design and development of high-deformable high-strength line pipe without Mo addition suitable for strain-based design. Highdeformable high-strength line pipe with cost effectiveness as well as good low-temperature toughness and seam weld toughness was developed.