Hazelnut (zhēn zǐ) is one of the important nut tree species, is a woody oil tree species, for the birch family hazelnut genus (Corylus) plants, the world's 16 species, mainly distributed in Asia, Europe and North America. Fruit shape like chestnut, ovoid, with yellow-brown shell. The seed kernel is fragrant, sweet and oily, and is harvested in the fall when it is ripe.

The main origin 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. Xinji in Hebei has begun the plains scale planting.