As an important electromagnetic wave signal receiving and transmitting equipment, antenna reflector is widely used in radar, communication and astronomical observation and other fields. The positional accuracy of the sub-reflector of a large aperture radio telescope is a key indicator that affects the receiving performance. This paper briefly expounds the principles and characteristics of various position measurement methods, and summarizes the main advantages and limitations of various technical solutions, providing a reference for the exploration and innovation of position and attitude measurement methods for radio telescope sub-reflectors.