Optical fiber temperature measurement technology is a new technology application that has only developed in the past ten years, and at this stage, the technology of metal temperature temperature measurement is still in the process of scientific research and development trend and gradual promotion. In some temperature measurement sites that cannot be solved by traditional methods, some of its outstanding characteristics have been slowly revealed. The selection of general infrared thermometer is likely to lead to large data errors, and even can not work normally in the field of strong magnetic field to carry out temperature detection of the overall target object. For example, high frequency smelting of alloys and vulcanized rubber of plastics, microwave heating of wood and textiles, food, medicine, etc. in the whole process of oven temperature detection. Fiber optic temperature measurement technology has great advantages in those industries.