Abstract: As one of the important components in the fire security system, flame sensors are widely used in industry and military applications. With the emerging of new technologies and devices, the test and evaluation of fire sensor becomes important in the fire security system, not only for the proper and safe operation of the system, but also for the development of new sensor. A UV-IR source and its application as fire sensor are presented, and the new technology and development of such sensor are discussed. This UV-IR source consists of two black bodies, a UV lump, filter components and a diaphragm. With the setting of wave length, the size of diaphragm and the temperature of the black body, it can produce artificial fire radiation, which is used to characterize sensors. The radiation expressions of IR source, simulations results and test results are given. Calibration techniques using standard sensor method are introduced. Experiment results show this UV-IR source can meet the need in the test of fire sensor in UV or IR applications.