Telemetry, Tracking and Communication ( TT&C) system is an important component of the International Space Station ( ISS ) .Reliable TT&C system is the foundation to ensure the long term steady operation of ISS .An in-depth comparative study on the TT&C system in ISS was con-ducted in this paper .First, the composition of ISS was introduced , then the characteristics and working methods of S Band System , Ku band system , and Space-to-space Communication system were described .In the end , the characteristics of the system and the enlightenment to us were sum-marized ,which may serve as an important reference for the development of the TT&C system in Chi-na .%测控通信系统是国际空间站的重要组成部分，可靠的测控通信系统是确保空间站长期稳定在轨运行的基础。对国际空间站测控通信系统进行了较为深入的研究，介绍了国际空间站测控通信系统的组成，梳理了国际空间站中继S系统、中继Ku系统、空空通信系统的链路特性与工作方式，并总结归纳了国际空间站测控通信系统多手段备份、采用高性能编码等特点，以及对我国的启示，能够为我国测控通信系统的发展提供借鉴与参考。
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