In order to realize acceleration measurement by the fiber Bragg gratin g (FBG),an FBG accelerometer model based on the single diaphragm for acceleration sensing is proposed,and the FBG is fabricated by usi ng the method of full viscosity.Firstly,the sensing principle of the model based on the single diaphragm is theoretically analyzed,t he sensitivity of acceleration is optimized,and the responses of acceleration se nsitivity and frequency based on th e single diaphragm are analyzed and discussed.Secondly,the accelerometer based on the model is designed.Amplitude-frequency characteristi c and resonance frequency and linear response of the FBG accelerometer are experimentally researched,respectively.When the frequency is less than the resonance frequency,experimental results indicate that it has a good flat range response and linear response.The li near fitting degree is 99.8%,the sensitivity is 36.6pm/G,and relative error is 3.68%.The anti-directional disturbance ability is experimentally research ed,and the cross-sensitivity is less than 1.3%.Experimental results indicate that the FBG accelerometer based on the model has good respo nse characteristics,which is promising to be applied in the project field by reasonably designing the structure parameter.