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Taking apples as experimental materials, effect of pretreatment of high voltage pulsed electric field on dielectric properties was studied. The effect of pulse voltage, frequency on dielectric properties was analyzed. The theory of electromagnetic field was used to analyze the influence mechanism. The results showed that equivalent capacitance and equivalent impedance of apple were both decreased when the pulse voltage and the pulse frequency increased. The parameters of high voltage pulsed electric field had a certain effect on dielectric properties. The obtained conclusion could provide reference for further research on the effect of electrical parameters on dielectric properties for different fruits and vegetables, and also parameters optimization of high voltage pulse electric field pretreatment.