In order to realize a high acceleratio n sensitivity,we propose a novel all-metal fiber-optic accelerometer based on Michelson interferometric configuration and using flexible reed structure,by wi nding sensing arm in axial direction an d reference arm in transverse direction to improve the accelerometer′s energy c onversion efficiency to enhance acceleration sensitivity.Meanwhile,such a struc ture can decrease the interference between the sensing and reference arms.In this paper,the fundamental principle and the design of the novel sensor are intr oduced respectively,and the acceleration sensitivity and resonance frequency of this sensor are analyzed theoretically.The acceleration sensitivity and crosstal k are measured by an experiment.When the thickness of the reed is 1mm and the q uality of the mass is 208g,the acceleration sensivity of the accelerometer is 556rad/g (54.9dB).A method is proposed to improve the accelereation sensitivit y.Moreover,the crosstalk of the accelerometer is studied and the reason why the accelerometer receives a different crosstalk in a different direction is found.A t last,the measurement results imply that when the resolution is 10－4 ra d/Hz (100Hz).The minimum detectable acceleration signal of this accelerometer is 200ng/Hz.With this all-metal s tructure,the fiber optic flexible reed accelerometer can better adapt to the spe cial requirements of weak signal detection.