青藏铁路建设所面临的主要问题是高原缺氧、冻土,近年来随着人们环保意识的不断增强,青藏铁路的环境保护也日益成为国内外关注的焦点。——高原缺氧给铁路建设及运营所带来的问题。青藏铁路沿线自然条件恶劣,人烟稀少。海拔4000米以上地区,空气稀薄、气压较低,历年平均气压620～544mb,为海平面的60%～70%。空气中含氧量少,比海拔平面减少 The main problem facing the construction of the Qinghai-Tibet Railway is the hypoxia and frozen soil on the plateau. As people’s awareness of environmental protection continues to increase in recent years, the environmental protection of the Qinghai-Tibet Railway has increasingly become the focus of attention both at home and abroad. Problems Caused by High Altitude Hypoxia to Railway Construction and Operation. The natural conditions along the Qinghai-Tibet Railway are sparsely populated. Above 4000 meters above sea level, the air is thin and the pressure is low. The annual average pressure is 620 ~ 544mb, which is 60% ~ 70% of the sea level. Less oxygen in the air, less than the elevation of the plane