ＧＰＳ水准的精度主要取决于ＧＰＳ大地高差转换为正常高高差所需要的高程异常差的确定精度。本文提出确定测点间高程异常差的高程异常变化梯度法和垂线偏差法，介绍方法在隧道高程控制测量中的应用及其效果，讨论其实现技术。 The accuracy of the GPS level mainly depends on the accuracy of the determination of the difference in altitude anomalies required for converting the GPS elevation difference into a normal elevation difference. In this paper, we propose a gradient elevation method and a vertical deviation method to determine the height anomaly difference between measuring points, and introduce the application of the method in tunnel height control measurement and its effects, and discuss its implementation technology.