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For the requirement of high-speed data exchange in intelligent data process unit of large-scale constellations, the design of using SpaceWire network to combine both the payloads and inner modules of intelligent data process unit together is presented. The system connecting standard SpaceWire interface, routing with logic address, using CCSDS protocol and RMAP protocol makes it easy to integrate new instrument into the network without knowing the details of the network. When any module with redundant part is blocked, the module can be transferred from nominal part to redundant part without any functional missed. Meanwhile, SpaceWire router can work out new route to the new destination automatically. Reliable methods are also considered in SpaceWire hardware and software design. When comparing with system without using SpaceWire network, there are obvious advantages such as less interface types, standard protocols, recoverable and supporting system elastic. In the test part, the data rate test, bit error rate test, auto redundant route test and route table reconfiguration test are carried out, the testing results shows that it performs great, and has good prospects for large-scale constellations application.