21世纪国民径济的可持续发展对铁路运输的需求会不断增长。从全国铁路网布局来看，西藏自治区 是一个空白点。本文从西藏区的资源优势、经济、路网及国防意义，进藏铁路的比选等论述青藏铁路格拉段建 设的必要性和紧迫性.从而加快建设西藏地区铁路网，结束西藏无铁路的历史.为21世纪西藏经济的腾飞奠定基础。

In 21st Century,due to the sustainable development of national economy? the requirement on railway transportation will be increased continuously.From the viewpoint of distribution of railway networks in whole country,the Xizang Autonomous Region is a blank area. The paper expounds the necessity and the urgency for constructing the Ge′crmu-Lasa Section of Qing-Zang Railway based on the following aspects;the superiority of resources in Xizang Region, its meaning concerned with econ?omy , railway network and national defence，the route selection and comparisons between the railways towards Xizang,etc, so as to quicken the steps for constructing railway network in Xizang Region,concluding the history of non-railway in Xizang Region and providing a base for economic evolution of Xizang Region in 21st Century.