In Yantou Village, Chishui Town, Weinan, Shaanxi Province, villagers' genealogy records that Yantou was named after the Tang Dynasty. Notes on Water Classics: "Jiaoshui reaches Shijie in the west. In the third year of Emperor Wu of the Han Dynasty (note: BC 120), it was made in Kunming Pool. " Lei compiled the Annals of Chang 'an, a medicine town in Luo Yuan, saying, "Feng Shui flows northward and enters the Wei River through Yantou, Yuancun and Zhou Wenwang Temple. Water flows into the canal from here, into the Shixiangkou in the northwest, and fills the Chi Ming in Kunming. " The stone alley mouth is now the stone box mouth. Qing Yongzheng's "Shaanxi Tongzhi": "Where the water in Seoul comes from Kunming Pool, the water in Kunming Pool comes from Shenshui and Fandu Water, and Emperor Wu enters the pool." Also refers to this weir.