In order to improve the stability of the opt-mechanical system which was produced by the primary support of the space High Resolution Imaging Spectrometer (HRIS)

the expressions of the stability of the opt-mechanic system were analyzed from three ways. The lugs

which were the traditional support structures to the space optics remote sensing

were used to support the opt-mechanical system

but the results showed that it couldn’t meet the need of the three-mirror-off-axis anastigmat (TMA) imaging system. Then

a new coupling support structure by two axes was advanced and some theory analysis was done to it. Finite element analysis of the 3D model was realized by software MSC.PATRAN during the optimum designing. The results showed that the one mode of natural frequency was 95Hz under sine vibration loading. The maximum RMS value of the mirror surface was 12nm and the maximum PV value was 60nm. The angle rotation by Z axes of the primary mirror was reduced from 55''to12''. The spectrum data of the opt-system under the hot vacuum environments verified the analysis results. Coupling support structure was feasible to meet the need of the rigidity and the heat-stability of the opt-mechanical system.