The important application significance of infrared polarization detectors for detecting and recognizing infrared camouflage targets and infrared dim targets is analyzed. The infrared polarization characteristics of objects and their representing methods are introduced in detail and the influencing factors of infrared polarization characteristics are expounded. Finally, the polarization fusion imaging algorithm is emphasized, which includes data preprocessing, infrared polarization fusion, and fusion image reprocessing. This artidle is of great significance for studying the fusion imaging of infrared polarization detectors