研究目的: 国际铁路联盟( UIC) 主要制订适用于其所有成员国的通用性、基础性或涉及多个专业间接口的国际标准，主要包含产品标准及过轨标准，而 UIC 限界标准就是通用性的过轨标准，其理解显得尤为重要。UIC 限界标准最重要的部分就是关于动态限界的基准轮廓线的理解，国铁规范没有相对应的概念。本文的研究对于正确理解 UIC 规范有一定的参考意义，对完善我国高铁标准体系和加快实施我国高速铁路要“走出去”战略有一定的指导作用。
研究结论: UIC 规范和国铁规范双方关于限界规定的理念有很大的不同。UIC 标准的动态限界的基准轮廓线是规定的固定值，是用来确定机车车辆制造限界和沿线建筑设备接近限界的轮廓线; 而国铁标准的“建筑接近限界”和“机车车辆限界”按照规定是确定值，以此来反算“车辆动态包络线”，因此我国限界规范体系应该做一些适当完善，某些具体设计参数规定不能过于硬性，多突出基本理论、基本原理、计算过程以及新的理念，保持设计灵活性和可操作性。
Research purposes: The UIC is responsible for drawing up the universal and basic international codes or the international codes of the basic interface involving in a number of professions for its member countries，including product codes and interchange service codes． The UIC gauge code is one of the universal interchange service codes，so it is very important to correctly understanding the UIC gauge code． The most importantly understanding the UIC gauge code is to understand the basis Kinematic guage reference profile，but now there is no the corresponding concept in the chinese railway codes． The study on the UIC codes presented in this paper has a certain reference significance to the correct understanding UIC codes and has a certain guiding effect on improving the standard system of China high － speed railway and speeding up implementation of the strategy of " Going out" ．
Research conclusions: The UIC gauge code is very different from China in concepts． The UIC Kinematic guage reference profile is provided as the fixed value，and is used for defining the manufacturing clearance of rolling stock and the profile clearance of the wayside building along the track． But in China railway codes，thees two ones are the fixed values in accordance with requirement to inverse the " vehicle dynamic envelope" ． So the China railway code should be improved and the specific design parameters should tend to more basic theory，basic principles and the calculation process with new ideas to maintain design flexibility and operability．
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