In order to improve the measurement accuracy of fiber Bragg grating (F BG) strain sensors,a fiber grating sensor theoretical sensitivity coefficient and experimental sensitivity coefficient strain calibration method is proposed in view of the application of FBG sensors in the model pipe pile tes t.The method calibrates the sensitivity coefficient of the micro-gray grating strain sensor by experiment, and compares it with the theoretical analysis sensor sensitivity coefficient.At the same time the strain gauge is pa sted on the model pipe of installing FBG sensor position.The experimental results show that the FBG strain sensor tes t results are more accurate, which lays a foundation for the model tube pile monitoring technology based on F BG strain sensor.At the same time,the method is applicable to the calibration of the FBG sensor application and the model pipe pile,and can obtain the real data accurately reflecting the deformation of the model pipe pil e,and improve the measurement accuracy of the fiber grating sensor in the model pipe pile test.At the same tim e,the method is simple and easy to operate,which lays a foundation for the application of fiber Bragg grating sens ors in testing and engineering,and accelerates the application of FBG sensors in the monitoring and application of model tube pile load transfer.