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The real-time data in China’s TT&C network is the most important experiment information about space launch. The real-time data exchange plays a pivotal role in the process of the space flight mission. The application data encapsulated by custom-built network protocols used in the space center is not able to be effectively monitored and deep analysed with commercial software. A passive network data monitoring scheme is designed according to the features of TT&C network architecture and traffic, using dedicated hardware and low-level drivers for network to acquire high-speed data. A analyser for Packet Data eXchange Protocol (PDXP) that is one of real-time application protocols of TT&C network is developed specifically based on open source software Wireshark. Experimental results show that the techniques presented above with powerful capabilities of packet capture and filtering and good expansibility of protocol can be used to monitor and analyse various TT&C network traffic as an effective means of monitoring data, evaluating performance and diagnosing fault in space center.