近几年GPS技术在西部地区高速公路测设中得到了很大的应用,根据高速公路沿线带状地形、地貌及构造物分布情况,GPS测量中网形以等边直伸网居多,因此基线边长存在着很大的差异,特别是短边基线的存在,直接影响着GPS基线测量的精度,文章分析了GPS测量中短边方位测量对精度的影响因素,提出了相应的解决办法。 In recent years, GPS technology has been widely used in the survey of expressway in western China. According to the distribution of strip terrain, topography and structure along the expressway, the net shape of GPS surveys is mostly equilateral straight nets. Therefore, The existence of short baseline has a direct impact on the accuracy of GPS baseline measurement. The article analyzes the factors that affect the accuracy of short-side azimuth measurement in GPS measurement and proposes the corresponding solutions.