Small pixel infrared detector has become an important direction of infrared detector technology development. The reduction of pixel size can improve the detection and recognition distance of infrared imaging system,reduce the cost of infrared detector,and reduce the size,weight and power consumption of the system. In this paper,the development progress of small pixel infrared detectors at home and abroad is introduced,focusing on 10 μm pixel pitch 1024×1024 infrared focal plane detector developed by the 11th Research Institute of CETC. The 10 μm pitch FPA is n-on-p planar structure with a 5 μm cutoff wavelength,effective pixel rate of 99 % and quantum efficiency of 60 %.