1. Walnuts are widely distributed in China, reaching Heilongjiang in the north, Yunnan and Guizhou in the south, Xinjiang in the west and Shandong and Liaoning in the east. Walnuts are distributed in most parts of the country. As for the distribution of walnuts that meet the standard of literary play, they are mainly produced in North China, Northwest China, Northeast China and Southwest China. Among them, the quality of wenwan walnut in Beijing, Hebei, Tianjin, Shanxi and other places is the most outstanding, and it is also the origin of traditional fine varieties. Climate and environment are also conducive to the planting and growth of wenwan walnut.

2. Northwest China, including Shanxi, Shaanxi, Gansu, Ningxia and Xinjiang. Shaanxi Qinling mainly produces autumn walnuts such as lanterns, which are big, full in shape and have many burrs. The output is also high. Other parts of Shaanxi also produce official hats and other varieties, which are too big, and the shape and cortex are quite different from those of Beijing and other places. There are also wild pecans in some mountainous areas of Xinjiang, which belong to autumn walnut varieties and have average quality. The situation in Gansu and Ningxia is similar.