"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 gets its name from the beautiful legend of "Tianhe fills with water". More than 3,000 years ago, the Tianshui area was densely populated, with adjacent houses, "beautiful mountains and rivers, and dense forests." 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 once prosperous and fertile 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 gap, thus forming a lake, Tianshui Lake. 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 the four seasons are graceful." At that time, people said that the lake was connected to the Tianhe River and 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 became known as "Tianshui".