GPS measurement can greatly reduce labor intensity and improve work efficiency. It is generally recognized that the efficiency of GPS surveying is 2-3 times of that of conventional surveying methods.<br>(5) GPS high-precision height measurement, like high-precision plane measurement, is an important field of GPS measurement application. Especially in the current situation that high-grade highway is gradually developing to mountainous and hilly areas, it is often difficult to implement conventional geometric leveling due to the limitation of regional terrain conditions. GPS height measurement is undoubtedly an effective means<br>