Abstract: In order to achieve homo-disperse of nano TiO₂, nano TiO₂ was treated by the silane coupling agent and the Zn-Al/waterborne epoxy composited coatings containing silane modified nano TiO₂ were prepared by incorporating different mass fraction of TiO₂ nanoparticles in the epoxy resin and Zn-Al powders via solution blended process. The combination action of the nano TiO₂ and Zn-Al flake powder in the coating was explored. The XRD and FTIR were used to analyze the phase composition and structure of the coating. The micro morphology and elementary composition of the coating surface were representated by the SEM and EDS. The corrosion resistance of coatings was investigated by polarization curves and electrochemical impedance spectroscopy(EIS) tests. EDS and FTIR results suggest that the modified nano TiO₂ is symmetrical dispersion in the coating, the crosslinking reaction of nano TiO₂ and epoxy resin makes the coating more pyknoticly. The EIS tests show that due to the filling effects of Zn-Al flake powder and nano TiO₂, the corrosion behavior of the silane modified nano TiO₂-Zn-Al/waterborne epoxy coatings is more slower than that of nano TiO₂, when the content of nano TiO₂ increases to 4wt%, the corrosion current density of the silane modified nano TiO₂-Zn-Al/waterborne epoxy coatings is 9.86×10^-6 A/cm², the corrosion current density is higher one rank than none nano TiO₂.