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With the development of electronic technology, the volume of electronic components is getting smaller and smaller,the computing power of the processor is becoming more and more powerful,the capacity of the memory is growing,the transmission rate of the bus is getting higher and higher,electronic devices are becoming more and more integrated,the cost is getting lower and lower. Under such background,the design concept of the electrical system design of the spacecraft is also advancing with the times,to reduce the volume weight and power consumption of the electrical system,in order to improve the spacecraft's mission capability,at the same time to speed up the development of the progress,reduce development costs,an urgent need to develop a new type of electronic integrated structure of spacecraft. In this article,compared with the advanced international electrical system architectures,analyzed the disadvantages of internal electrical system architectures on the aviation and spaceflight.To meet the need of new spacecraft electrical system,the integrative design base principle of new spacecraft electrical system in China is presented.Also,the software and hardware architecture and the realizing method of functions are assumed.