Simultaneous transmit and receive(STAR)is a common technology in the radio frequency field.Break-throughs in STAR core technology can drive technological innovation in radio fields such as radar and electronic warfare.This paper first introduces the challenge and key point of the STAR technology.Then,the available re-search results relative to three parts of an STAR system,namely the propagation domain,analog domain,and digit-al domain are reviewed and summarized.Finally,it points out the development direction of the STAR technology.This paper is expected to promote the development of the STAR technology.