The application field of electro-optic equipment in infrared band is becoming more and more extensive, and the requirement for IR simulation technology is urgent increasingly with continuous development of the new material, photoelectron detectors and electro-optic technology today. The principle of the infrared radiator was analyzed, the key technology of IR simulation was discussed, and the feasibility of IR simulation engineering practice in short distance was studied. The IR simulation technology is introduced in order to provide the IR simulation signals for the infrared equipments test and examination mainly based on IR feature of targets outside in short distance.