Walnut skin is better if it is thin and benevolent. As far as nutritional value is concerned, walnuts are superior to pecans, and the quality of walnuts in the north is higher than that in the south. The largest producing area of northern walnut is Xinjiang, and Shangluo in Shaanxi and Hotan in Xinjiang have the longest history, but the best variety of walnut is Aksu, and Wensu 185 is the best, followed by Xinxin 2 thin-skinned walnut, Aksu 185 walnut, Yecheng walnut and Hotan walnut. The variety of paper walnut in desert garden is Wen 185, and its shell is as easy as peanut shell.