Abstract: A self-adapting FBG (Fiber Bragg grating) dynamic sensor system based on the temperature controlled filter FBG is investigated. Using the semiconductor cooling device the temperature of the FBG filter was controlled, so that the wavelength of the narrowband filter FBG could be controlled to suit the environment temperature variation, and the self adaptation of the temperature variation be realized. Using the reference channel and wiping off the system noise, the measurement precision was improved. The system dynamic strain resolution is 9.745×10-10 (Hz)-1/2.