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Inter-satellite network protocol is the basis of satellite communications. At present, the function of network protocol became more and more complex with the development of network technology, it makes the testing at protocol very important. The transport layer protocol which is at the core of inter-satellite network protocol receives great attention . Due to limited conditions of navigation constellation, currently, the entire network testing can not be done on transmission protocol. Therefore, a protocol testing system is needed to meet the test requirements. Based on analysis of navigation constellation communication network features and inter-satellite transmission protocol, a protocol testing system is designed. This system realize the transport layer protocol of inter-satellite network protocol and simulate communication between multiple satellites through the data bus. The test result shows that, the protocol testing is able to meet the test requirement of inter-satellite transport protocol.