Abstract: Three-phase PVB/PZT/CB carbon black composites were prepared by using hot-molding technique with the conductive carbon black as the conductive particle.The influence of the carbon black on piezoelectric and dielectric properties of composites was investigated.The results indicated that the piezoelectric and dielectric constant of the composites increased by adding suitable quantity carbon black,and the PVB/PZT/CB composites show a high dielectric constant and lower dielectric loss.The maximum dielectric constant of 120 and piezoelectric constant of 56pC/N for PVB/PZT/CB composites can be achieved respectively when volume fraction of carbon black is 0.5% and PVB is 30%.