A serials of acrylated epoxidized soybean oil oligomer were synthesized at different temperature, feeding ratios, feeding model, different dose of inhibitor and catalyst. The UV curing coating was then prepared and the gel content in cured film was analysed. The results show that increasing reaction temperature can be improving the esterification degree of the production, but exorbitant temperature can be make a adverse affection.In our trial, when the reaction temperature is 120℃, the esterification degree was maximum to reaction . Appropriate content of epoxy soybean oil in reaction system is beneficial to improving the esterification. The maximum esterification degree was achieved in cured film when the feed ratio of ESO(epoxidized soybean oil)and acrylic acid is 1.12:1(n:n). Changing the feeding model can be changed the esterification degree of the complex. In our experiment, the feeding model that the inhibitor and epoxy soybean oil were premixed together before the acrylic acid and catalyst was added improved the esterification degree. Increasing the dosage of the inhibitor can be improve the gel content. But when the dosage preponderate over 0.2%(mass fraction)，the gel content and the esterification degree of the cured film was decreased . The maximum esterification degree was achieved when the dosage of the inhibitor is 0.15%.