In this paper, using the acid anhydride and amine curing agent to solidify bisphenol A type epoxy resin, epoxy soybean oil and liquid rubber modified bisphenol A epoxy resin curing system, in different temperature experimental observation of modified epoxy resin water weighing method experiment, calculation of water balance water absorption rate, obtain the sample weighing with inlet time curve. According to the curve can be calculated from the diffusion coefficients of water. Through the DSC experiments using epoxy soybean oil and liquid rubber modified epoxy resin in different soaking temperature Tg, according to Arrehnius equation can get water in resin diffusion activation energy. Free volume of the polymer is influenced by water in the polymer absorption and diffusion are important factors, polymer free volume fraction is the main factor of water diffusion coefficient and activation the experimental data can be studied in different soaking temperature measurement, epoxy resin samples after soaking water quality change of modified epoxy resin - anhydride ( polyether amine ) sample of water diffusion behavior. Through the control of the epoxy soybean oil and rubber liquid adding amount, flexible adjustment of the water resistance of epoxy words: epoxy soybean oil; liquid rubber; epoxy coating; water resistance 希望可以帮到你!