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There is no unified software protocol for traditional spacecraft testing system and the difference between software protocols for each spacecraft testing system is very large, resulting in portability of spacecraft testing system software very poor. In light of this issue, we design a software communication protocol based on XML description and transmission, and develope the software for spacecraft testing system. The result proves that the use of XML description protocol and XML serialization and deserialization technology simplifies the design of system software and enhances the portability of system software.