1 and 1267, Kublai Khan of Yuan Shizu decided to build a new city in the northeast suburb of the old capital, which is famous as the capital. Since then, Beijing has become the national capital. In the Yuan Dynasty, the scale of Beijing was magnificent. In order to meet the needs of urban water use, especially water diversion irrigation, Guo Shoujing presided over the construction of the White Float Weir, and introduced the Changping White Float Spring and other large and small flowing springs in Xishan into Dadoucheng to connect with the water pool, and then connected with Tonghui River to reach Tongzhou.

2. In addition, don't open Jinshui River, introduce Yuquan landscape into Dadu Palace, and solve the water problems of Gong Yuan, Dadu City and Tonghui River to some extent.

3. Due to the navigation of the Beijing-Hangzhou Canal and the development of maritime traffic, the economic ties between the north and the south of China have been strengthened, and the trade prosperity of Dadoucheng has also been promoted. In the early Ming Dynasty, in order to strengthen the defense in the north, it was decided to move the capital from Nanjing to this place. 1403, the capital is called Beijing, which is the origin of Beijing's name.