In recent years,companies and institutes in China conducted co-research projects and achieved many important improvements.These improvements include: development of X70 and X80 grade pipeline steel, welded pipe, and fitting, breakthrough of the application limit of helical submerge-arc welded pipe, establishment of the technical route for alternative application of helical and longitudinal submerge-arc welded pipe with high-strength and large-diameter in main pipeline, first investigation of dynamic fracture and crack arrest in China, which adopts the Battelle Two Curve method to predict the toughness requirement for the 1st and the 2nd West-east Gas Pipelines, investigation of strain-based design for oil & gas pipeline, which solves problems of the methodology and high strain pipe application in seismic and active faults areas, investigations to control the corrosion and strain aging of high strength pipe, and so on.