The earth dragon is mainly used in Feng Shui, because when we look at Feng Shui, we need to use a compass to determine the direction of the mountain, which is the direction. Feng Shui turns the direction into 24 directions, which is the 24 mountains. There are yin and yang in these 24 directions. In order to distinguish them, the 24 mountains are divided into earth dragon, heaven dragon, human dragon. Earth dragon refers to Jia, Bing, Gengren, which are Yang, Chen, Wei, Xu, and Chou is Yin.