This paper introduces the design and key technologies of Sband and Xband dualpolarized T/R module，T/R module has two kinds of transmitting channel and receiving channel wave band，each ransmitting channel and receiving channel each have two passage，totally has eight passage. Multichannel transceiver of multiple bands in a small space work arising from the complexity of the channel and the resulting electromagnetic compatibility design and deat dissipation interfering analyzed and explained，while adding Lange bridge on each band transmission channel，so that the phase of each band of two ransmitting channels of 90° displacement，the component can realize the dual polarization transmission. Test result enunciation should the T/R have double waveband，big power transmitting，dualpolarized and the physical volume small characteristic.