Based on the theory of infrared radiation and the principles of temperature measurement using infrared thermography , an experiment about the ektexine temperature field of a certain refinery’s large facility was conducted. According to the acquired temperature from every infrared thermography , a combine2image’s software under the same color code was developed and the infrared thermography outspread2figure of the facility was made by the software. Finally , the security of the facility was estimated with this outspread2figure.