Introduction to dragon and horse: The picture of dragon and horse and river - "Book of Records: The Book of Marquis Holding the River" states that "Fuxi has the world, and the picture of dragon and horse comes from the river." Fuxi in turn evolved into Bagua, and later became "Book of Changes" "source. The Divine Turtle and Luoshu - "Shangshu·Hongfan": "Heaven gave Yu, and Hongfan was in nine domains", which is related to Dayu's flood control. After he succeeded in controlling floods, he divided the world into nine states, and in turn established nine chapters of laws to govern society. , handed down and included in "Shangshu", named "Hong Fan".