Abstract: According to the high-precision installation requirement of the large-scale antenna pedestal orbit,the orbit installation template is designed to actualize the accurate embedment of the foundation bolts. And thus the positional tolerance of the orbit is guaranteed in the adjustable range. The image level, dial indicator and laser tracker are used to measure the positional tolerance and levelness to guide the installation and adjustment of the orbit effectively. And the measured results satisfy all technical parameters of the orbit eventually.A new simple feasible and more precise method of establishing horizontal plane is presented in this paper.Namely, three datum points are provided by the electronic level and then measured by the laser tracker to establish high-precision horizontal plane. This paper can be used as reference for installation and measurement of other similar large-scale orbits.