The growth of type-Ⅱ superlattice materials,the device preparation methods and the recent evolution of new type-Ⅱ superlattice materials systems are briefly summarized.type-Ⅱ superlattices theory and process technology have been continuously improved,presenting diversified material systems and higher performance.Although HgCdTe technology is still the market 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 comprehensively replacing HgCdTe technology in the field of infrared application have become increasingly clear.