研究目的:搞好困难山区铁路设计非常重要，本研究的目的是使困难山区铁路设计更好。
研究方法:综合西南地区多条铁路的勘测设计、配合施工中的经验、教训、体会，提出困难山区铁路设计工 作应注意的问题。
研究结论:要提高困难山区铁路的设计水平，必须选好线路走向方案，主要技术标准应经比选确定，长大 紧坡地段和展线地段应自上而下定线，应尽可能避免浅埋隧道和隧道群，对大型弃碴场应查明地质条件，避免 人为地质灾害。
Research purposes: It is very important to do well the design of difficult mountain railways，which is also the research purpose of this paper.
Research methods: Some focus issues have been put forward in the design of difficult mountain railways based on the experiences in survey，design and coordinating construction of many railways in southwestern China.
Research Conclusions: In order to improve the design level of railways in difficult mountain area a proper route aternatives should be chosen and the main technical standards should be determined by comparison. The long and deep section of sufficient grade and extension of line should have top-down alignment， avoiding shallow burying tunnel and tunnel group as much as possible. We should identify the geological conditions for large-scale spoil site and avoid man -made geologic hazard.
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