The theoretic and experimental result of interferometric polarization-maintaining fiber micro-vibration vector sensor are represented. Because of polarization-maintaining fiber structure, the sensor avoided instability of polarization. With phase generated carrier (PGC) technology, the influence of initial phase of interferometer was sliminated. Based on these methods, the stable signal detect was realized by the fiber optic micro-vibration vector sensor. The measured natural frequency of the system was 370 Hz, which agrees with the theoretic result 375 Hz. The acceleration sensitivity in experimental results reached 340 rad/g in frequency band of 5～200 Hz, and it matched 356 rad/g predicted by theory. Vector character of the sensor was obtained too. The acceleration sensitivity in 45° was 0.7 times of that in 0° and the orthogonal crosstalk coupling was -26 dB below. In the system, minimum measurable phase was 10-5 rad and minimum measurable acceleration reached 3×10-8 g.