Abstract: The high power active feed network is more and more used in the satellite-borne phased-array radar. An applicable example of one kind of satellite-borne T/R system composed of high power active feed network is presented,and the key technologies in the satellite environment such as amplitued-phase consistency, anti-Muhipaction, anti-space-ESD is also disscused. The system is composed of 16 sets of high-power solid-state T/R modules, 1 set of feed network and RF-cable network.