The thin mirror active optics simulation model is built based on a great deal of domestic and international reference,and the model is analyzed.The simulation result indicates that the active optics can correct low-frequency error.And a thin mirror active optics experiment system is set up,thin mirror active optics experiment is carried on,and the result indicates that the surface figure can be corrected to the coated surface figure(λ/10) through the active optics.And the thin mirror active optics is able to correct Pri Astig best,Pri Spherical and Pri Trefoil better,but Pri Coma hardly,which has some instructions for coating large aperture thin mirrors.