Abstract:The synthesis of epoxidezed sunflower seed oil was studied.The influences on the epoxy value of product of some factors such as stirring speed,the amounts of formic acid,hydrogen peroxide and reaction temperature,were discussed.The optimum conditions were as follows:0.5 mol formic acid per mol double bond in the sunflower seed oil,2.0mol hydrogen peroxide per mol double bond in the sunflower seed oil,reaction temperature 60¡æ,and  reaction time 6h.The epoxy value and the iodine value of the final product under these conditions was 5.5% and  10 gl/100g,respectively.