It is a challenge to integrate Multidisciplinary Design(MD), Multidisciplinary Analysis (MA), Multidisciplinary Optimization (MO) processes with the satellite system design flow. A system-oriented software framework was formulated and implemented for the satellite integrated design by using Variable Complexity Modeling (VCM) method and Production Data Management (PDM) technology. The design conception, structural components and functional characteristics were introduced. Then the software was tested by the example of Lunar Exploration Satellite conceptual design. The results show that it is an effective approach to apply Multidisciplinary Design Optimization (MDO) technology to satellite integrated design.