Abstract: With the increase of frequency band of radio telescope, the antenna aperture is larger and larger, the accuracy of main surface and the requirement of antenna installation are higher and higher. In this paper, taking the field installation of 70 m antenna reflector as an example, the structural differences between 70 m antenna and other large antenna reflectors at home and abroad are compared and analyzed, the installation process of the reflector is described from the installation process and the installation & measurement methods of the reflector are introduced. The installation, detection and location problems of the large spherical truss structure are solved by designing special tools. The general principle of determination and conversion of measurement reference during installation is put forward. The design accuracy requirements of the 70 m antenna reflector are met and the field installation efficiency is improved. This research has practical reference significance for the installation of large antenna reflectors.