Abstract: Aiming at low integration of traditional multiload remote sensing satellite systems, a kind of common structure large aperture microwave-optical integrated space imaging method was proposed.The Cassegrain load structure was designed to be shared by microwave-optical imaging systems.The received signal was split and imaged through the wavelength splitter.The main reflector structure of the load was a paraboloid composed of microwave antenna and multi optical reflectors.The optical primary mirror system was composed of discontinuous paraboloid with the distributed structure of Fizeau interference Golay6, and the imaging loads were spliced with modular design.The modular design was easy for the large aperture structures to be processed and assembled.Compared with the traditional multi-load satellite, the modular design is more integrated and the system more simplified.The simulation analysis of the integrated space load was carried out through Matlab and Zemax.The results show that the load meets the requirements of the minimum effective area of microwave imaging and the modulation transfer function（MTF）value of optical imaging.

Key words: microwave load, optical load, integration, modularization, joint imaging of microwave and optical loads