Carya cathayensis, also known as "Little Walnut", grows in a natural environment with superior climate, fertile soil and lush vegetation. It is a pure wild fruit, a natural green food bred by the aura of Dashan, and it is pollution-free. Among 17 kinds of pecans in the world, several pecans in Lin 'an have the highest nutritional components, large grains and thin shells, and the best taste. It is also one of the most delicious varieties of dried fruits in China. Carya cathayensis is one of the "old three treasures" in Lin 'an. Carya cathayensis pulp (kernel) contains 7.8-9.6% protein, and its amino acid content is as high as 25%, among which 7 amino acids are essential for human body. Carya cathayensis pulp (kernel) contains 22 mineral elements, among which calcium, magnesium, phosphorus, zinc and iron, which play an important role in human body, are very rich and have high nutritional value, and have the effects of moistening lung, strengthening kidney, reducing blood fat and preventing coronary heart disease. Natural Carya cathayensis (kernel) is processed by its unique technology and scientific formula. It is a crispy and delicious tourism and leisure product with endless aftertaste and a good gift for relatives and friends.

Good walnuts have thin and clean shells, full flesh and white meat.

The shell of inferior walnut is thick, the flesh is dry and moth-eaten.

The shell of inferior Sophora japonica is hard, shriveled and meatless, and the pulp is spicy or moth-eaten.