The setting up of the Xiongan New Area in Hebei Province is also aimed at reducing congestion and pollution and will help phase out functions from Beijing that are not related to the capital.
The Xiongan New Area is of national significance after the Shenzhen Special Economic Zone and the Shanghai Pudong New Area, according to a circular issued by the ruling Communist Party of China's Central Committee and the central Cabinet.
The circular described the step as "a strategy crucial for a millennium to come."
The New Area, about 100 km southwest of downtown Beijing, will span three counties that sit at the centre of the triangular area formed by Beijing, Tianjin, and Hebei's provincial capital Shijiazhuang, state-run Xinhua news agency reported.
The zone will explore a new model of optimised development in densely-populated areas, and restructure the urban layout in the Beijing-Tianjin-Hebei region, the circular said.
Beijing has a population of about 21.5 million and it aims to cap the number at 23 million by 2020.
Xi called for efforts to build Xiongan into "a demonstration area for innovative development." It should prioritise ecological protection, improve people's well-being and protect and carry forward the Chinese traditional culture, he said.
The New Area covers the counties of Xiongxian, Rongcheng and Anxin, and is home to Baiyangdian, largest freshwater wetlands in northern China. It features geological advantages, convenient transportation, an excellent ecological environment, ample resources and lots of room for development, according to the circular.
A number of wholesale markets in Beijing's central areas have been shut or relocated, and some of its administration is planned to be moved out to the eastern suburbs in Tongzhou.
Authorities intend to transform the region into a new growth pole as China's economy has slowed down.
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