s: Permanent ground deformation (PGD) is one of the main causes of buckling, fracture and leakage of mountain pipeline and heavy loss of life and property.Design and safety evaluation of mountain pipelines in PGD zone with the existing “Strain-based method” and technical standards urgently awaiting further research figures out the dangerous statuses of in-service high-grade steel pipelines. The current situation of “strain-based” failure discrimination is firstly analyzed and summarized. Technical actualities and imperfections of strain calculation methods (analytical, numerical, and experimental methods) and safety evaluation methods for pipe-soil interaction are indicated by the main patterns of pipe failure with the "allowable strain" and "calculated strain" under complex PDG working conditions. Future research content and path of the design and safety evaluation based on actual work conditions and pipe-soil interactions are synthetically proposed, while considering the future development trend and production needs of mountain pipelines in China.