Abstract: The titanium surface was modified by triethyl phosphate (TEP) to decrease its hydrophilicity. The BSA adsorption on the surface was investigated at different initial concentrations， different temperatures and pH values. The adsorption dynamics was examined by the ultraviolet visible absorption spectrograph (UV). The reason shows that during adsorption the BSA concentration in the solution sharply decreases in the first 40 min and then tends to be constant. The isotherm and adsorbed quantity were obtained according to the Langmiur formula. The BSA can be adsorpted onto the surface as shown by the Fourier transformed infrared spectroscopy and X-ray photoelectron spectroscopy.