The chrome-free passivation film was made from mixed silane KH858 and KH580 modified by fluorine titanate,which was coated on the surface of hot dip galvanized steel following drying and curing. The thickness, adhesion, hardness of film were tested; The neutral salt spray testing was done to research the resistance to chemical corrosion of the passive film. The anti-electrochemical resistance of the surface film was characterized by using Tafel polarization curves and electrochemical impedance spectrum techniques. The results showed that the average film thickness was 5 . 2 μm, the film stripped area was 3 % and the film hardness was 3 H, which may meet with the national standard and industrial production requirements. Furthermore, the film’s anti-corrosion to chemistry and electrochemistry was excellent . The performance of organic silane composite passivation film modified by fluorine titanate was obviously better than the film without any modification.