It is first one of thin mirror active optics in China which cost four years (from 1990-1994) to set up。It has primary mirror with aperture of 500mm and thickness of 6mm。Accuracy of wavefront correction for the experimental system can reach 0.04μm(RMS)。Its success lay down an important foundation for mega-science project-LAMOST。

　  It is first one of segmented active optics in China which consists of three hexagonal sub  mirrors。Every sub-mirror is spherical mirror with diagonal of 250mm and curvature of 3000mm。The experimental system can reach 0.07 arcseconds (RMS) with accuracy of co-focus。It can frequently obtain and maintain diffracted image of co-phase with aperture of 220mm at λ=650nm (within approximately twenty minutes )。Its success lay down a sound foundation for mega-science project (LAMOST)。

3: Outdoor active optics experiment facility (a small LAMOST)
   The experiment facility includes: 1):one of submirrors of Schmidt corrector plate MA and its active supporting system; 2):one of submirrors of spherical primary mirror MB and its supporting system; 3):alt-azimuth mount;4):focal plane and Shack-Hartmann wavefront detector。
    Two submirror has same diagonal of 1100mm，but different thickness of 25mm and 75mm respectively。The experiment facility is actually small LAMOST with aperture of 1m and optical axis length of 40m。Outdoor active optics experiment which can simulate different submirror and track celestial body in real time has been conducted by the experiment facility。
　 In 2002，close-loop outdoor active optics for thin mirror experiment succeed (80% encircled energy within 0.5 arcseconds )。 In 2004，open-loop experiment succeed (80% encircled energy within 1.5 arcseconds )。