Hazelnut (zhēn zǐ) is one of the important nut tree species, is a woody oil tree species, for the hazelnut family Hazelnutaceae, there are 16 species around the world, mainly distributed in Asia, Europe and North America. The fruit is chestnut-like, ovoid, with a yellow-brown shell. Seed kernel gas aroma, sweet taste, with oily, autumn maturity picking, harvesting. The main source of Turkey, in our country, hazelnut large-scale cultivation planting is relatively small, but the vast mountainous areas of Northeast and North China, there are wild varieties, the local people collected to sell as mountain goods.