FBG based sensors have been increasingly used for the health-condition monitoring of high-speed railways,for the superior advantages of absolute measurement,anti-electromagnetic interference,high precision and multiplexing integration of sensing network.It can be noted that the deformation of substructures of a railway in operation can be affected by the temperature induced by the mechanical friction and the ambient temperature variation.For the temperature-sensitive characteristics of fibre Bragg grating(FBG)sensing element,temperature compensation measure should be considered to remove the temperature effect on the FBG,so as to accurately reflect the deformation state of the monitored structure.For the surface-attached FBG sensors,the traditional temperature compensation method ignores the influence of the interaction between FBG sensor and the monitored structure on the sensing signal,which may lead to the compensated value smaller than the actual value.For this reason,modified function is proposed to enhance the measurement accuracy of the FBG sensors in this paper.Laboratory test has been conducted to validate the effectiveness of the modified function.The research in this work presents a reliable instruction for the better interpretationof testing data measured by FBG sensors applied to the high-speed railway structures.