Evening primrose oil (EPO) mainly consists of  omega 6 series polyunsaturated fatty acid, in which linoleic acid takes up 74%, while there is approximate 10% γ-linolenic acid. EPO is specially famous for its remarkable effects on decreasing blood lipid, anti-atherosclerosis and  inhibiting platelet aggregation, protecting and treating thrombus, lowering blood pressure as well as resisting irregular heart rate, simultaneity diseases like block of heart and head, and the like caused by problem of blood circulation system are able to be well treated. Additionally, the efficacies of regulating immune function and avoiding gene mutation are other notable characteristics of the EPO; moreover, it also has significant inhibitory effects on the tumor metastasis and leave little chance of cancer. Other symptoms which are related to premenstrual syndromes can be improved and relieved dramatically. It is particularly beneficial to renovate the damaged cells of diabetic patients, anti-inflammatory functions and protect gastric mucosa from canker.