In order to implement the community electromagnetic security detection, a new type of distributed interferometric fiber optic vibration sensor was developed. The photosensitive fiber was based on M-Z interference by using interference detection cable vibration to establish perimeter detection sensors. When there is external disturbances of sensing optical fiber, interference fringe will produce significant change therefore the perimeter security early warning. Experiments were carried out on the frequency of 13.0678 Hz and 20.012 Hz triangle wave modulation signals respectively. Results show that the interferometric disturbance detection system is very effective. As long as there is a slight cable movements, waveform will produce significant change. The system is proved to be effective to distinguish between presence of external disturbances, which is of great significance to fiber safety.