In order to reduces outside loads’ influence on surface precision of primary mirror in space remote sensing camera

the design of adopting diverse flexible support structures which restrict primary mirror’s freedom of motion independently is brought forward. By adopting CAD engineering analytical software

dynamic and static rigidities as well as thermal characteristics of primary mirror system are analyzed emulationally. Based on this foundation

structural parameters of flexible support in primary mirror system are amended. Under precondition of ensuring support rigidity

the influence on surface precision of primary mirror due to gravity、assemblage stress and temperature diversification is reduced

and endurance of impact and libration is ensured during the launch. Detecting results show that the surface precision of primary mirror reaches PV:λ/4 and RMS:λ/50，which can meet the special requirements for the primary mirror of space remote sensing camera.