Xi 'an, referred to as "Gao", was called Chang 'an and Haojing in ancient times. It is a prefecture-level city under the jurisdiction of Shaanxi Province. It is the capital, sub-provincial cities, megacities [126], national central cities [139], the core area of Xi 'an metropolitan area, and the core area of Guanzhong plain urban agglomeration [16 1].

National important scientific research, education and industrial base. [1-3] By the end of 202 1, there were two counties in the city, with a total area of 10752 square kilometers (including Xixian New Area) and a permanent population of 145 people (including Xixian condominium)

Xi 'an is located in the middle of Guanzhong Plain, bordering Weihe River in the north and Qinling Mountain in the south. Xi 'an has been called "Eight Rivers Around Chang 'an" since ancient times, [147] is between east longitude 107 40'- 109 49' and north latitude 33 42'-34 45'.

It belongs to warm temperate semi-humid continental monsoon climate. Xi is a "world historic city" designated by UNESCO 198 1. [8] It is one of the important birthplaces of Chinese civilization and the Chinese nation and the starting point of the Silk Road. [5-7] In history, 13 dynasties successively established their capitals here.

Xi is the best tourist destination in China and one of the cities with the most international image in China. There are two heritages listed in the World Heritage List, namely, the Mausoleum of Qin Shihuang and Terracotta Warriors, the Big Wild Goose Pagoda, the Little Wild Goose Pagoda, the Daming Palace Site in Chang 'an in Tang Dynasty, the Weiyang Palace Site in Chang 'an in Han Dynasty and the Xingjiao Temple Tower.

There are also Xi 'an City Wall, Bell and Drum Tower, Huaqing Pool, Zhong Nanshan, Datang Furong Garden, Shaanxi History Museum, Forest of Steles and other scenic spots. There are seven "double-class" universities in Xi, including Xi Jiaotong University, Northwestern Polytechnical University and xidian university.