A metal base and ceramic pieces of optical fiber grating temperature sensor encapsulation structure and technology of the combination was proposed,which is used to resolve the requirements of the satellite on-orbit temperature real-time monitoring reliability.Optical fiber grating was bended to C word and fixed on the ceramic chip,in order to avoid ceramic material thermal strain causes a grating axial strain.Ceramic chip was attached to metal groove,which is adopted thermal conductive silicone.The robustness and good thermal conductivity is allowed,and the unit under test mechanical deformation and thermal deformation on the influence of the grating is isolated.Thermostatic water bath is used to simulate ground experiment.The relationship of reflection wavelength and temperature was demarcated.And the relationship of reflection wavelength and sensor’s response time with temperature variation was demarcated.Results show that it not only meet the temperature sensitivity and response speed,but meet the requirement of satellite temperature monitoring of the reliability of the sensor at the same time.