Abstract: The organic inorganic ordered biomimic nanocomposite films were prepared by means of molecular self assembly method. The friction reducing behavior of the films sliding against SAE 52100 steel was examined on a dynamic static coefficient procession measurement apparatus at ambient conditions. The worn surface morphologies of the films were observed with a scanning electron microscope. The depth distribution of the elements along the worn film surfaces was determined by means of X ray photoelectron spectroscopy. As the results, both polymerized and un polymerized films have good friction reducing properties. The friction coefficients of the films sliding against steel is as low as 0.1 which is considerably lower than that for microscope slide (0.78). Moreover, the polymerized film has longer antiwear life than the un polymerized one. This is attributed to the improvement of the structure and strength after polymerization.