According to the size of hazelnut fruit and the thickness of shell, China can be divided into four varieties: fire hazel, flat hazel, hairy hazel and Sichuan hazel. Hazelnut is the most famous specialty in Xiaoxing 'anling. Wild hazelnuts in Xiaoxing 'anling mainly include Corylus heterophylla, Corylus heterophylla and Corylus heterophylla, and a few hybrid varieties of Corylus heterophylla and Corylus heterophylla.