Abstract: With the development of digital technology,people from all domains are improving and developing their fields by using it.After the widely use of GPS technology,it largedly reduced the intensity of the surveyors,improved our work efficiency,so it was accepted by most surveyors.The application of GPS will be the main for a long period in surveying field.Although the GPS level precision of the static measurement,the quick static measurement,the dynamic measurement was widely used and accepted by most people,the GPS elevation precision was not solved in all.This article analyzed the restriction factors of GPS elevation,mainly discussed the surveying feasibility of GPS elevation,it also analyzed the precision factors who affected GPS surveying elevation,suggeted some methods and measures to elimate or extinct the error effects.