The operating temperature of infrared detectors can be elevated to reduce cooling requirements, thereby minimizing the size of cryocoolers and Dewar structures and enabling detector miniaturization. In this paper, the development of high operation temperature (HOT) infrared detector in North China Research Institute of Electro-optic is introduced. Through key technology research on Type-II superlattice material design, chip fabrication process, and miniaturized cooler, a 640×512 Sb-based Type-II superlattice detector with pixel pitch of 15 micrometers is developed, with a working temperature of 140 K, a quantum efficiency of 61%, an effective pixel rate of 99.8% or more, and a NETD of less than 20 mK. The detector performance is comparable to that of an HgCdTe detector at 80 K, and with satisfactory imaging results. t