2. Both Kun Gua and Gen Gua belong to soil in gossip, the root Gua is called Yang Tu, and Kun Tu is called Yin Tu. * * * The five elements belong to the soil property, but the difference is that the root soil refers to the soil in the mountains and the Kun soil belongs to the soil. The representative figures of Kuntu are not only soil, expensive soil and root soil, but also fields and lands, all of which are broken according to the five elements of true soil. We found that most of the words related to soil are soil and field, so according to Kun's five elements, we broke the words related to soil and field in the eight diagrams and nine rich people, and soil lived in the middle, so the words "zhong" and "Yang" belonged to soil, and they were separated from the root soil only according to the five elements of soil. For example, the yellow characters represent the sweetness of five flavors, and the sweet characters represent the color. It is also the root soil to judge that the five elements of the soil can not be divided. For example, heavenly stems: Wuji belongs to the soil, while earthly branches such as Chen, Xu and Ugliness do not belong to the soil, which can be divided according to Yin and Yang. But these are not necessary in the study of names, as long as it is judged that the five elements are main soil and dark soil.