The work aims to improve the corrosion resistance of galvanized steel sheet. Single silane film and bilayer silane film of bis-[γ (triethoxy silicon) propyl] tetrasulfide (BTESPT) and vinyl triethoxy silane (VTES) were prepared on galvanized steel surface. The composite film was prepared by mofification and doping with corrosion inhibitor and rare earth salt. The corrosion protection performance of various silane films for galvanized steel in 3.5% NaCl solution was evaluated by potentiodynamic polarization curve test. The optimum technological conditions of single VTES silane film were: V (VTES):V (ethanol):V (water)=7:30:70, pH=4.5, hydrolysis of 2 days, film-forming time of 20 min, curing temperature of 100 ℃ and curing time of 30 min. The corrosion resistance of VTES silane film was slightly lower than that of BTESPT silane film, but it was more economic. Bilayer silane film could improve physical barrier function so as to further increase the corrosion resistance. When ceric salt and silane were hydrolyzed together and then formed film again, the corrosion resistance of the silane film was the best. Addition of 0.01 mol/L pyrrole to silane hydrolysis solution could produce silane film of excellent corrosion resistance doped with corrosion inhibitor. Ceric salt- and pyrrole modified silane film provides favorable protection for galvanized steel.