Abstract: Confronting with new operation needs, integrated multifunction RF technology is stepping into deep development phase with more mature hardware architecture, more extensive functions and higher integrity, from terminal process integration to frontend integration, from Radar-EW-ESM-COMM integration to microwave-EO/ IR integration and electromagnetic command-control integration. In this paper, development history of integrated multifunction RF technology is overviewed, current multifunction RF integration projects are discussed, and key enablers including simultaneous transmit-receive (STAR), ultra-wideband array, microwave photonics and integrated waveform design are analyzed.