The acoustic sensitivity mechanism of distributed feedback fiber laser was analyzed. The key technology of acoustic isolation and vibration isolation is to blocking-up the tranfer and impact to the structure of string. According to the analysis results, a packaging structure of the main body for the arc neutral axis slot was designed. The active phase shifted fiber Bragg grating of distributed feedback fiber laser is fixed in the slot of the package structure under a certain pre-tension. The fiber Bragg grating is attached to each point on the curved plane. The experimental results show that the effect of sound bending and other effects are effectively eliminated by the proposed structure. Laser line-width will not be broadened under acoustic and vibration shock. Moreover, the wavelength temperature tuning coefficient is increased from 10 pm/℃ to 30 pm/℃, the output performance of distributed feedback fiber laser is stable.