Biopolyimides poly(ATA-CBDA) made from of 4,4'-diamino-alpha-truxillic acid dimethyl ester (ATA) and 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) were synthesized and its electric volume resistivity measured at various electric voltages at 10-60 degrees C. The volume resistivity for Kapton and biopolyimide films showed a sudden decrease at a critical electric field of 2.6 x 10(7) and 1.0 x 10(7) V/m, respectively. The activation energy at low electric field for Kapton and biopolyimide was 68 and 90 kJ/mol, respectively, meanwhile at high electric field for Kapton and biopolyimide was 45 and 74 kJ/mol, respectively. These results indicate that the carriers for electric conduction for biopolyimide weakly interact with the polymer chain and the biopolyimide contains many conductive carriers than Kapton.