The laser based on mutual injection system plays an important role in the study of laser chaotic communication and high power laser output.It is of great value in laser cutting,secure communication and military field.At present,many researchers have been carried out in semiconductor lasers based on mutual injection,solid-state lasers,fiber lasers and so on.In this paper,the research progress of mutual injection lasers at home and abroad is summarized,the latest research results of the three kinds of lasers mentioned above are introduced,and their prospects are prospected.