Tianshui is the longest-used place name in local history. It first started in the third year of Yuanding reign of Emperor Wu of the Han Dynasty (114 BC). Tianshui is named after the beautiful legend of Tianhe filling with water. More than 3,000 years ago, the Tianshui area was densely populated, with adjacent houses, beautiful mountains and rivers, and dense trees. However, at the end of the Qin Dynasty and the beginning of the Han Dynasty, long-term battles, fighting and successive years of drought turned the then prosperous and prosperous Shangcheng into ruins, and the people were in dire straits. Legend has it that one night, just as people were falling asleep, suddenly the sky was roaring with strong winds, thunder and lightning, and with a golden light shining, a red light appeared on the ground. Suddenly, the ground shook continuously, and a large crack opened in the ground amidst the loud rumbling sounds. I saw the river water pouring down from the sky and pouring into the large crack, forming a lake, "Tianshui Lake". Unexpectedly, the water level of this lake is stable, the water quality is pure, sweet and mellow, it never dries up in spring, never overflows in summer, and is beautiful all year round. At that time, people said that the lake was connected to the Tianhe River, and they also called it Tianshui Well. Later, Emperor Wu of the Han Dynasty heard this legend, and he ordered the new county to be built next to the lake in Shanggui North City and named it Tianshui County. From then on, it was named Tianshui.