In view of the steel bridge coating maintenance construction cycle is long,cumbersome process,especially the bolt head,weld and other local small area area,due to the edge or uneven surface,the traditional material construction is prone to thin coating early failure problems.By the development of a new environmental protection coating with composite function,good wettability with the substrate and good matching with the traditional coating system,when the local coating damage occurs,the coating repair work can be quickly completed in the steel bridge,so that the problem of large difficulty and long cycle to repair the coating defects in the steel bridge industry can be solved.