In order to ensure the reliability of tunnel lining structures in cold region during the operational phase,PDS(probability design) module and Monte Carlo Lad in super cube sampling method in ANSYS are employed to study the main factors affecting the reliability of the lining structure and the reliability index based on the Kunlun Mountains tunnel project and with a view to the influence of frost heaving force,surrounding rock pressure and the weight of the structure stress on surrounding rock lining structu...