In order to meet the demand that modern satellite be high-reliability and long-life, flexible restructuring was executed among the components insides atellite or among the satellites in a mission group, by means of grid and multi-disciplinary technology, based on characteristics of digitalized system or equipment of satellite and over-all properties of system. Thus system reliability ofsatellite or satellite group could be increased. A technique that integrates flexible reliability design, testing and fault diagnosis/recovery processing was put forward, and design & analysis to reliability, testability and fault diagnosis/recovery was combined with design to function/performance of products. The corresponding integrated design & analysis model was established, and simulation for application was carried on. Therefore, the digitalized system or equipment of satellite could be ensured simple-structured, low-cost and reliable.