Developed the soybean conductivity of varied frequency during ohmic heating using independent researched source which outputs high power bipolar rectangle voltage waveform.The experiment showed that soybean conductivity raised when the power frequency raised on high frequency.The reason is the capacitive load worked and the conglutination layer of electrode reduced.Soybean milk conductivity reduced when the power frequency reduced on low frequency.The reason is the repaid of electrolysis and polarization.