Abstract: The vinyltriethoxysilane films on the surfaces of Q235 steel were prepared by hydrolysis of silane solution. The corrosion resistance of hydrolyzing vinyltriethoxysilane films prepared for different immersion time in the aqueous solution of 3.5%NaCl was investigated by the electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization. The results showed that the vinyltriethoxysilane films prepared with the silane solution hydrolyzed for 8 days on the surfaces of Q235 steel has the optimal corrosion resistance because the anode and cathode reactions are restrained during the corrosion. The corrosion current density of the Q235 steel coated with the vinyltriethoxysilane films is decreased by almost three orders of magnitude and the polarization resistance Rp is increased by about two orders of magnitude as well as its low-frequency impedance is increased by more than three orders of magnitude compared with those of the blank Q235 steel sheets without hydrolyzing vinyltriethoxysilane film.