"The map comes out of the river, the book comes out of the Luo River, and the sages follow it." The Book of Changes, Part I, first recorded the "Book of Changes". The "Hetu" was produced in Mengjin County, Luoyang City, Henan Province, and people are already familiar with it; but where did the "Luoshu" come from? There have always been many doubts and no conclusion. "Dragon horses carry the map, and the divine tortoise carries the book". The legend of the Hetu and Luoshu in ancient times has become a huge mystery in Chinese traditional culture for thousands of years. At the 4th International Symposium on Heluo Culture held not long ago, experts and scholars from home and abroad found the answer to the "Luoshu origin": Luoning, which is Xichangshui Village, Luoning County, Luoyang City, Henan Province. Legend has it that one summer in ancient times, Dayu chiseled open the Dragon Gate, and the lake formed by the Yi River in the south of the Dragon Gate flowed into the Luo River. A turtle as big as a millstone floated from the bottom of the lake. Dayu's men saw it and hurriedly swung their swords to cut it, but were stopped by Dayu. Later, Dayu put the turtle into the Luo River. One day, Luoyang City was shrouded in fog. Dayu led his men to the bank of Luo River to check the water situation. Suddenly, a beam of colorful light rose in the foggy Luo River. With the appearance of the light, the fog covering the city gradually dissipated. Dayu looked carefully and found a turtle floating in the place where the light rose. The light came from a jade plate on the turtle's back. It turned out that the turtle presented this jade plate to Dayu in gratitude for Dayu's rescue. Later generations called this jade plate "Luoshu". There are 65 red characters on "Luoshu", and Dayu didn't recognize any of them. After repeated speculation, he sorted out nine aspects of content, including calendar, laws, and planting. Based on the nine chapters of "Luoshu", the ancients later sorted out a scientific code named "Hongfan", which has been passed down to this day. (No pictures yet, welcome to provide.) (No pictures yet, welcome to provide.)