Infrared imaging has the advantages of strong detection ability and all-weather work, and is known as the "sixth sense" of human beings. Using infrared imaging to detect human objects in a scene has become an important research direction in the field of computer vision. Infrared radiation is the basis of infrared imaging. Firstly, the basic principle of infrared radiation, the working principle of infrared detection devices and equipment, and the characteristics of thermal infrared images are introduced. Then, the main tasks, implementation methods, application fields and characteristics of thermal infrared human target detection technology are further introduced. challenges, etc.