Abstract: A nontoxic silanized treatment process for hot-dip galvanized steel was investigated by the orthogonal experiment.The protection of silane films on galvanized steel surface was evaluated by neutral salt spray test and polarization test.The factors affecting the corrosion resistance of silane films were discussed,including concentration of silane solution,concentration of methanol,hydrolysis time,hydrolysis temperature,pH of silane solution and immersion time.The optimum technological parameters were obtained,and the mechanism was analyzed.The results show that the silane films had the optimum anti-corrosion properties under the conditions of concentration of the silane solution 7%,concentration of methanol in hydrolysis solvents 10%,hydrolysis time 6 h,hydrolysis temperature 40℃,pH of the silane solution 4 and immersion time 120 s acted as a physical barrier of galvanized steel and suppressed both cathodic and anodic reactions of corrosion simultaneously.The time of white rust occurence on galvanized coating was delayed.The silane films obtained excellent corrosion resistance under the optimum technological conditions.