The generating technology of infrared gray image supplies the data for experiments of target recognition system of infrared gray image. It also does the knowledge-based signal pre-processing on source data generated from the infrared modeling and imaging system, so that the output data can fulfill the needs of following image processor. The generating technology of infrared gray image includes two parts of source data processing and data transmission and it consists of source data processing software, human-computer interface and data transmission card. The research of generating technology of infrared gray image lays the foundation for the half-reality simulation of recognition system of infrared gray image.