A quarter-circular arc piezoelectric Vibration energy harvester（VEH） based on nonlinear geometry is proposed with both bending moment and torque deformation mode, so it can effectively absorb multi-directional vibration at the same resonance frequency. The theoretical model of quarter-circular arc piezoelectric VEH is established to study the resonance frequency and the output voltage. In order to demonstrate multi-directional performance of the quarter-circular arc VEH, the stress distribution is compared with that of the traditional piezoelectric VEH in multi-direction vibration, and the output voltage of the circular arc piezoelectric VEH are relatively increased 267.26% in X-direction, 463.18% in Ydirection, and 17.24% in Z-direction. The external load is equipped in circuit to measure output power, whose matching resistance is around 21 k?, and the maximum output powers are 7.57 m W in X-direction, 2.39 m W in Y-direction, and 9.93 m W in Z-direction.
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