In order to realize the high-precision measurement of the two-dimensional (2D) vibration signal of the cable components in the long-span bridge, and to solve the problem of the large volume and mass of the existing fiber Bragg grating (FBG) accelerometer,a new miniaturized 2D FBG accelerometer is designed and studied in this paper.The designed FBG accelerometer is mainly composed of a biaxial arc hinge with a mass block,four fixed brackets,and an optical fiber engraved with four-segment array FBGs.By establishing the general dynamic equation of FBG accelerometer,the theoretical values of sensitivity and natural frequency are obtained. In addition,it is supplemented by Abaqus to carry out finite element simulation to verify the theoretical derivation results.The experimental test data show that the natural frequency of the FBG accelerometer is about 500 Hz.The arrangement of the dual FBGs allows the sensitivity to reach 595.2 pm/g.In addition,the symmetrical push-pull arc hinge design also has excellent lateral anti-interference and temperature self-compensation performance.Finally,taking a middle-supported concrete-filled steel tube arch bridge as an actual engineering case,the designed 2D FBG accelerometer is used to effectively measure the cable force of the sling.