The myth of "Zhu Yu's Nine Ding" first appeared in Zuo Zhuan's Three Years of Gong Xuan. According to legend, after the establishment of the Xia Dynasty, Kyushu was stable, the four seas were peaceful, and the country was rich and strong. When Yu Xia was 4 years old, Shi An asked for instructions: "Now there are more and more tributes from Kyushu. What should we do with it? " Yu Xia thought that the Yellow Emperor Xuanyuan cast a tripod successfully, and the tripod became a fairy, so he also thought that these donations could be used to cast a tripod, but he was worried that doing so would cause dissatisfaction among the governors. Later, he thought: casting a tripod is not necessarily for himself, but also for the whole world. Therefore, the determination to cast the tripod was strengthened. Later, Yu Xia asked Shi 'an to cast Jiuding, and stipulated which state's tripod should be cast with tribute. He also cast all the mountains and rivers in the whole state on it, and carved all kinds of monsters, rare birds and animals. After Ding Cheng, Yu Xia asked craftsmen to find ways to spread the above images for people all over the world to know what animals are harmful and what animals are beneficial, thus helping people all over the world. Yu Xia also requested that the tripod be cast heavy and large for long-term preservation. Shi An listened to Yu Xia's instructions. He found Boyi, took the classic map of mountains and seas, and then began to choose the place to operate, carefully copying and casting. Finally, I chose to cast the tripod outside Beijing, because the mountains and rivers there are beautiful and the people have casting technology. In a few months, it's time for Yu Xia to patrol every five years. He suddenly remembered that Shi An was casting a tripod at the foot of Jingshan Mountain, so he went to check it out. After Yu Xia's inspection, Shi 'an was asked to cast five male Jin Dingyang and four female Jin Yinding respectively according to the law that five should be positive and four should be negative. Shi An accepted Yu Xia's orders. Two years later, nine strange days appeared in the sky. In broad daylight, you can actually see the white star appear in the sky, and Jiuding is just cast at this time. Everyone knows that "Taibai is now in the daytime" is the symbol of Jiuding's casting. Yu Xia exultation, ordered the Jiuding immediately moved to Xiayi. Yu Xia regards Jiuding as the treasure of the town house, and all the governors appear before him, all of whom pay homage to Jiuding. Jiuding has therefore become a "destiny", symbolizing the supreme rights of a country and also symbolizing the unity and prosperity of the country. Jiuding has always been regarded as the most important ritual vessel in a country. In ancient times, anyone who asked the size of Jiuding could know that he was going to seize power. After the demise of the Xia Dynasty, Jiuding disappeared in constant migration, and I don't know where it is until now. Now, words like "keeping one word is better than the Central Plains" all come from Zhu Yujiu's tripod, which shows that Zhu Yujiu's tripod has a great influence on later generations.