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Combining with the characters of reliability, real-time and sharing-data of the synthesized electronic system of small satellite, Dual-Port RAM’s characters are analyzed. A precept of using Dual-Port RAM to share data among Multi-CPU is put forward, and using Dual-Port RAM to carry out high-speed and reliable parallel communication and sharing data is designed. The whole system’s software and hardware is easy to design with fully exploiting resource and higher reliability and real-time feature. An application and test analysis of Dual-Port RAM’s Multi-CPU system in the synthesized electronic computer is offered, the results show that the system runs stably and reliably, which have highly real-time and data processing capacity.