In the process of designing the medium Earth orbit （MEO） spaceborne high resolution and wide swath （HRWS） synthetic aperture radar （SAR） （MEO-HRWS-SAR） system based on multiple frequency sub-pulses （MFSPs），there are a series of problems such as global coverage，low visibility，two-dimensional （2D） defuzzification along the distance azimuth，and system complexity optimization.In this paper，a three-layer design idea，i.e.，orbit，architecture，and then parameters，is proposed.The two-dimensional fuzzy suppression and system optimization are carried out with space，time，frequency，etc.The typical low Earth orbit （LEO） SAR system is used as the reference system to complete the design of MEO-HRWS-SAR system，and the HRWS SAR imaging is realized on the MEO platform.In addition，the temporal resolution of Earth observation on the spaceborne platform is greatly improved.Finally，the validity of the design method is verified by simulation.The proposed design method has certain engineering application value.