Inroduces the significance of developing waterproof paint used for road bridge of passenger transport. Determines the important raw materials and the dosage of the paint by orthogonal test. Studies the effect of resin and initiator on curing speed, the additive qualities of resin and monomen on the breaking elongation rate and tensile strength, as well as the impact of color fillings dosage on main physical properties of the paint. And investigates the humiture influence on the aridity of the paint from the aspect of construction.