The large aperture laser transmission mirror is a crucial optical unit of the high power solid-state laser in the inertial confinement fusion(ICF)facility.Based on the engineering practice of the SG-Ⅲfacility,the technology status and key problems of the low-stress mounting configuration for the mirror are summarized firstly.Then,a general mechanical model of the deformed mirror is built with the elastic mechanics theory.Furthermore,a brand new low-stress mounting configuration with flexure support is propo...