Sanyuan was called "Jiaxu" in history and "Chiyang" in ancient times. It is located in the middle of Guanzhong Plain in Shaanxi Province, and is named after Menghouyuan, Fengyuan and Bailuyuan. Sanyuan is the land of ancient capital. It has a history of 1.560 years since the capital was established in the seventh year of Taiping Zhenjun in the Northern Wei Dynasty (AD 446), and is known as "the capital of food and clothing, the mouth of hundreds of millions". The total area of the county is 576.9 square kilometers, and the cultivated land area is 537,000 mu. It governs 1, 9 towns, 4 centers, 172 administrative villages with a total population of 420,000.