It is anational key project in the Ninth-Five Year plan period funded by NSFC。

　The project group firstly developed computer-controlled active polishing technogy and fabricated polishing machine applied this technogy in China and successfully fabricated diameter 450mm active polishing disc as well as diameter 910mm paraboidal mirror with F ratio 2 and with surface accuracy of 1/30 wavelength(RMS)。Difficult problem for high spacial frequence error of surface during mirror fabrication of large aperture and deep asphericity as well as difficult problem during fabrication of large aperture tilted-axis aspherical mirror were solved。

　 The project group firstly developed fabrication technogy of very thiner mirror with flexible supporting and fabrication method of large aperture very thiner mirror with computer-controlled close-loop active optics technogy。Very thiner hexagonal plano mirror with 1100mm of diagonal，25mm in thickness (applied to LAMOST) was successfully fabricared。Adopting similar fabrication method as that of diameter 4-8 meter mirror，very thinner spherical mirror which is 1035mm in diameter and 26mm in thickness with surface accuracy of 1/27 wavelength(RMS) was successfully fabricared。That indicates that difficult problem of lower rigidity during fabrication of very thinner mirror is successfully solved。