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Tri order to obtain a PVDF piezoelectric film with high piezoelectric conversion efficiency, it is critical to increase the |3 crystal content in the PVDF film arid control the microstructure of the film. In this paper, a mixed solution of BiCl / PVDF was cast into a film in a strong electric field. The crystal phase composition and microstructure characteristics of the composite membrane were characterized by FT-IR, XRD and SEM. The composite membrane was assembled into a piezoelectric device and its piezoelectric response was tested. The results show that BiCl arid the strong electric field had a great influence on the microstructure and |3 crystal orientation in the composite film. When the concentration of RiCl was 2wt%, the crystallinity reached 76,5% and the |3 crystal content reached 89.5% in the composite film. The strong electric field promoted the formation and orientation arrangement of |3-crystal in the composite film. When it was cast in an electric field intensity of 750 kV/m, the BiCl/PVDF composite membrane was 60.8 V in piezoelectric response, 120.1/.W / cut in instantaneous output power surface density and 250 Hz in the maximum shock frequency. [ABSTRACT FROM AUTHOR]