The telemetry system is of great significance for evaluating the flight test results, fault positioning, health monitoring and trend prediction. In recent years, with the demand for high bit rate telemetry system, duplex communication and network telemetry constantly increasing, the TmNS was incorporated into the IRIG 106 standard by the Range Instrument Group IRIG, a subsidiary of the RCC, which represents the development direction of the next generation of telemetry systems. On the basis of introducing the development process of TmNS, the concept and definition of TmNS, typical architecture, hierarchical model and network-based data messages, system configuration management, time synchronization, Quality of Service(QoS), routing, source selection, security and other key technologies are elaborated and analyzed. Based on the development status of telemetry technology in China, the enlightenment of telemetry technology is summarized, and the development and prospect of TmNS is discussed.