介绍我国铁路客运专线的规划发展以及合理确定客运专线换轨大修周期的必要性,换轨大修设计中需要注意的外业勘测组织、合理确定设计锁定轨温及单元轨节长度、桥上及隧道无缝线路设计、终焊锁定轨温以及施工中需要注意问题。 This paper introduces the planning and development of China’s railway passenger dedicated line and the necessity of reasonably determining the period of track change and overhaul for the passenger dedicated line. The field survey organization that needs attention in the track overhaul design reasonably determines the design locking rail temperature and unit track length, Seamless line design, the final welding temperature lock and construction need to pay attention to the problem.