Oleuropein is a phenolic compound extracted from olive (Canarium album (Lour.) Raeusch., Gan Lan) leaves mainly. The olive tree belongs to family Oleaceae Olea genus of evergreen trees, and it is the world famous fruit and woody species. There is highly edible value for cultivating trees. Affiliated to famous economic forest and subtropical fruit trees, they are rich in olive oil which is considered as high-quality edible oil .