Abstract:HgCdTe detectors at high operating temperature realizing the functions of small size,light weight and low power consumption on the basis of ensuring the constant performance,has become an important detector for military reconnaissance,UAV and unmanned platform.In this paper,the theory and the research on HgCdTe detectors at higher operating temperature (HOT) are described,the device structure of P on N HgCdTe detector is mainly introduced.In addition,the research progress and applications of HgCdTe detectors at high operating temperature of Raytheon in America,Sofradir in France,AIM in German,Teledyne in America and DRS in America are reviewed.