Abstract: Explosion-driven ferroelectric generator (EDFEG) has important applications due to its excellent properties of high energy density and small volume. The output of EDFEG is based on the depolarization of ferroelectric during shock wave compression. In the present work, a new experiment method was developed to investigate dynamic resistivity of PZT95/5 under shock wave compression, in which a pulse capacitor was used as an output load. A current leakage in shocked PZT95/5 was observed in the experiment at a shock stress of 3.5 GPa after the depolarization of all ferroelectrics. This current leakage was just related to the resistance of shocked PZT95/5 and the voltage applied. The resistivity of shocked PZT95/5 was calculated for a longer time than the shock transit time of the sample. The factors that reduced the efficiency of output charge were analyzed. Furthermore, new experiments were designed to eliminate the effect on depolarization of ferroelectrics from boundary rarefaction. Two shots of experiments with different capacitance loads produced different voltages across the PZT95/5 ferroelectrics stack. These experimental results show that efficiency of output charge was improved obviously, and that the higher the electric field was, the more the resistance of PZT95/5 ferroelectrics decreased. In conclusion, the resistivity of ferroelectric ceramics has little effect on the efficiency of output charge from ferroelectric ceramics.