This paper briefly summarizes the research results of type II superlattices from Germany,the United States (CQD,JPL,QmagiQ,NRL,Teledyne and Raytheon),Sweden (IRnova),Israel SCD and Japan,as well as the domestic development status.The successful implementation of the VISTA program in the United States and technological breakthroughs further accelerate the development of type II superlattice infrared detection technology from theory to reality.Although HgCdTe technology is still the mainstream at present and for a long time to come,type II superlattice technology can challenge HgCdTe in terms of overall system performance and cost.The advantages of type II superlattice technology in replacing HgCdTe technology in the field of infrared application are becoming increasingly clear.Compared with foreign countries,domestic type II superlattice technology development has some technical basis,but there is still a certain gap from the industrialization promotion and application,we can learn from foreign advanced theory and technical experience and combine with the specific practical process to gradually make breakthroughs.