Objective The aim of this study was to observe the change of bacterial adhesion on pure titanium coated with nitrogen-diamond like carbon（N-DLC） films and to guide the clinical application. Methods N-DLC was deposited on titanium using ion plating machine, TiN film, anodic oxide film and non-deposition were used as control, then made specimens adhering on the surface of resin denture base for 6 months. The adhesion of Saccharomyces albicans on the titanium surface was observed using scanning electron microscope, and the roughness was tested by roughness detector. Results The number of Saccharomyces albicans adhering on diamond-like carbon film was significantly less than on the other groups（P
