Study on Application of FBG Sensing Technology for Dam Safety Monitoring XIN Si-jin (Fiber Optical Sensing Technology Research Center,Wuhan University of Technology,Wuhan 430070,China)The embedding technology of the FBG sensor in concrete structure has been studied based on FBG sensing principle. The monitoring technology of FBG sensor for the changes of the stress and strain within the concrete structure under the applied load and the comparative experiment of the FBG senor and the common vibrating wires sensors in concrete beam have been investigated. The results show that the FBG sensors, which can realize a real-time and on-line monitoring, have higher measurement accuracy, better interference resistance,long-term stability and simple structure. Thus, the FBG sensor has an extensive prospect in dam safety engineering.fiber bragg grating (FBG); strain sensor; dam safety monitoring