We analyzed the effect of 4 different methods in stacking films to improve the miniature piezoelectric microphone′s sensitivity. There is no effect to stack piezoelectric film by direct laminated or conductive adhesive bonded in miniature microphones. However,using the conductive ring to connect films can increase the microphone's sensitivity of 6 dB. The experiment results show that the microphones use the thin conductive ring to connect films have more stable performance than the microphones use thick conductive ring to connect the films, and the frequency response curve become smoother.