We attempted to fabricate polyurethane derivatives (PU-CN, PU-DCM) LB films by using LB method. We investigated the monolayer behavior at the air-water interface and the surface morphologies of LB films was investigated by surface pressure-area (pi -A) isotherms and atomic force microscopy (AFM), respectively. Also, the electrical properties of PU derivatives LB films were investigated by using the conductivity, Schottky barrier height and the dielectric constant.