Abstract: A new process for the production of linseed oil epoxide through epoxidisation of linseed oil with formic acid and hydrogen peroxide in an organic solvent such as petroleum ether, with phosphoric acid as activator, was developed. Relatively fewer steps, much milder reaction conditions and shorter reaction time were the main advantages of this process. Furthermore, several properties of the resulting products of this method are good for use as plasticizer, such as the epoxide number＞7.8, the iodine number＜10 and the acid number＜0.5.