There are three mechanical supporting points of the large-size photoelectric equipment

base-plane’s obliquity come from the obliquity-sensor which fixed on pedestal of the photoelectric equipment

convert the obliquity to mechanical supporting’s elongate， drive the mechanical supporting level the base-plane. Introduced the reasons for choice three supporting points and mechanical supporting

designed the mechanical supporting and the entire transmission system

showed the drive circuit and automatic-leveling arithmetic. Automatic-leveling experiment indicated that the automatic-leveling system not only achieved the target precision

but also shorten the time of photoelectric equipment’s prepared to work.