根据青藏髙原及进藏公路、铁路的特点，提出进藏交通干线减灾选线的6项理论原则:与山系正交， 以髙桥长隧垂直爬上第三地势阶梯；分段展线,尽早脱离河谷上行至髙原面；绕避为主,沿河线路跨河、进洞躲 避山地灾害群；山地灾害坡向分异，沿河线路多经阴坡、少经阳坡；宁高勿低,沿河线路按重灾群灾上界高度定 线；髙原面线路多填少挖,按最佳填方髙度定线。研究目的:通过研究对比东京、巴黎、伦敦等典型世界城市扩展和市郊铁路和城际铁路发展的历史和经验,找到我国许多城市存在交通拥堵、环境污染等问题的重要原因是没有建立以轨道交通为骨干的公共交通体系,城市结构不合理,二者都与市郊铁路和城际铁路规划和发展严重滞后有关。本文呼吁扭转有些城市“先城内地铁后城外市郊铁路和城际铁路”的思想,在重视市内地铁、轻轨规划建设的同时,及早规划和建设市郊铁路及城际铁路。

Basis on characteristics of Qinghai-Tibet plateau and railway and highway entering into Tibet, six theoretical principles on selection route of traffic main-line entering into Tibet for mitigating mountain hazards as follows. l)Rotre perpendiculars to mountain chain and vertically climbs up the No. 3 relief step with tall bridge and long tunnel. 2)With circle and turn respectively, route separates oneself from river valley and climbs up the plateau surface as soon as possible. 3)It is main for mitigating hazards of route along river that avoiding mountain hazard gruop with adopting bridge of stride across the river and tunnel of entering into hill. 4)Because mountain hazards have difference related to aspect of valley ,most route along river must through schattenseite and the route of through another side must be a few. 5)In serious hazard and group hazard sections ,route along river would rather more high and must not more low. Elevation of the route must over largest level of the hazards. 6)On the plateau surface, most road must be filled and cut road must be a few. The route is determined by best high of filling.