The site selection of Anyang is not a random or unintentional choice, but has its profound historical background. "Yin country, Zuo Mengmen, right Zhangjiao, mountains in front, rivers behind." Yin Ruins in Anyang is located in the piedmont hilly plain where Taihang Mountain meets North China Plain, and it is also the middle section of ancient north-south traffic avenue. There is a big river (Yellow River) flowing in the southeast, and the river transportation conditions are superior, which is an important condition for choosing Anyang Yin Ruins as the national political center at that time. Xiaotun Shangdu is located on the bank of the Yellow River tributary valley. Yin Ruins, located on the south bank of Huanshui, is the earliest capital in China history. Historical Records Biography of Xiang Yu contains "Huanshui Nanyin Site". Yindu Palace District is built along Huan River and located in Xiaotun Village on the south bank of Huan River. The terrain here is high and close to the water source. Li Daoyuan in the Northern Wei Dynasty wrote in Notes on Water Classics: "Huan Shui comes out of the mountain and goes east to the north of Yin Ruins. According to the chronicle of bamboo script,' Pan Geng ascended the throne, and after the election, he moved to northern Mongolia to be called Yin', and Xiang Yu and Zhang Han formed an alliance here. " Up to 1982, 56 palace ruins have been discovered, which are distributed within the range of 280 meters from north to south and 0/50 meters from east to west. The kings of Yin were all built along the river. The largest palace site is about 85 meters long from north to south and 14.5 meters wide from east to west. About 200 meters west of the village, there is a trench in the late Shang Dynasty, which has been proved to be 7- 12 meters wide and 5- 10 meters deep, forming an annular defense facility with the curved part of the surrounding water. It was not only a "moat" to defend the palace area of Yindu, but also a river that was open to the outside world at that time. This shipping condition was an important condition for the establishment of Yin Ruins in the capital at that time. Therefore, Anyang Archives Bureau believes: "There is no Huan River in geography, and there is no Anyang in history." This summarizes the interdependence between urban site selection and ancient shipping. Archaeological excavations have confirmed this. "As far as underground drilling is concerned, there is an ancient river that flows into Guangrunpi from Hougang East to Southeast. There are ancient cultural sites on both sides of the river, which is the oldest river in the lower reaches of Lianshui. "