In the measurement of underground pipeline, there existed some problems, such as the control points and the maps data provided cannot meet the requirement of the construction, available data coordinate system is not consistent with the coordinate system of the engineer requirements. This requires us to establish a independent coordinate system or to make conversion between different coordinate systems in the process of construction. This article analyzes the reason, methods, advantages and disadvantages of establishing independent coordinate system, as well as the approaches of the coordinate conversion between different coordinate systems.%在地下管线测量中，会遇到提供的控制点、图件资料不能满足施工要求或者现有资料的坐标系统跟工程要求使用的坐标系统不一致的情况，这就需要我们在施工过程中建立独立坐标系或者对不同坐标系之间的坐标相互转换。本文分析了为什么要建立独立坐标系，讨论了独立坐标系统建立的各种方法和优缺点，以及不同坐标系间的坐标转换方法。
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