Combining with merits of robust estimation and neural network,based on quadratic polynomial fitting principle,the paper builds up new teaching model for GPS height fitting,and comparatively studies these methods by combining with new Yinchuan-Xi’an passenger special railway line engineering example,with a view to provide some guidance.%结合抗差估计和人工神经网络的优势，在二次多项式拟合原理的基础上，构造出新的数学模型来进行GPS高程拟合，并结合新建银川至西安客运专线工程实例，对这些方法进行了对比研究，以供参考。
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