This paper explains briefly what is FDMA-TDMA system, analyzes some of the crucial technical features of the system such as acquisition and synchronization, car-rier hopping, uplink power control, Demand Assigned Multiple Access(DAMA), controller etc. and procedure of their operations. 介绍了什么是多载波窄带时分多址卫星通信系统,分析了初始捕获及同步、跳载波、上行功率控制、按需分配、控制器等该系统的一些关键技术特点,阐述了它们的工作过程。