Using CdCl2 buffer solution as subphase for LB films deposition, it was achieved successively to fabricate the Y-type mixed LB films of (N-eicosyl pyridinium)-TCNQ(1:2) complex and arachidic acid. By measure of U.V spectra and capacitance, deposition status was confirmed. Electrical conductivity was measured on a perpendicular direction of the LB films and in consequence of calculated was average 2.5 × 10-13 - 2 × 10-14 S/cm.