It is proved that the effect of glue (ND353) paste is the main factor whic h affects the performance of the substrate Fiber Bragg grating (FBG) temperature sensor theoretically and experim entally.The experimental results show that the better the adhesive stick effect on the FBG is,the better the sensor perferm ance performance is with the water temperature for 25℃ to 90℃,as well as the repeatability,which means that the sensitivity reaches more than 36.6pm/℃ and straightness reaches more tha n 0.997.However,for sensors with poor adhesive stick effect,the sensitiv ity is reduced to below 12.7pm/℃,and there is alm ost no sensitization effect.The research results can also contribute to the encapsulation process of FBG temperature sensor.