Carya nut is a vivid "small oil pan" and an energy "bomb". According to the data of American food composition database, the fat content of Carya cathayensis fruit is as high as 74.27 g per 100g, which is a typical representative of nuts rich in flowable oil. The fat content of walnut is 58.8%, which is much less than that of hickory. Carya cathayensis fruit is mainly oleic acid, and walnut is mainly linoleic acid. Walnut is rich in α -linolenic acid which can be converted into DHA, and it is a famous champion among common nuts.

Generally speaking, Carya cathayensis is round, with thin and white shell, high kernel yield, large dried peach kernel slices, white color and high oil content. The selection method should be based on kernel observation. Nuts have the best plumpness, followed by dryness.