Temperature is a very important physical indicator in science research and production process，presently many researchers always need to measure the high amplitude，fast transient changes temperature.It has a unique advantage with fiber optic temperature sensor in high temperature measurement，so the coating technol-ogy is a key part of the fiber optic temperature sensor.An appropriate coating material was selected for high-tem-perature test，the physical and chemical properties of ZnO and MgAl2O4were also introduced.At the same time，according to the material properties，an appropriate coating method was chosen and used for the head coat-ing of blackbody cavity temperature sensor and the Surface coating of the FBG sensor.This technology is proved feasible and achieved the desired goals.