Xi 'an, known as Chang 'an in ancient times, is a prefecture-level city under the jurisdiction of Shaanxi Province. It is the capital of Shaanxi Province, an important central city in the western part of China, and an important national scientific research, education and industrial base approved by the State Council. By the end of 2022, the city had 11 districts and 2 counties, with a total area of 10,752 square kilometers (including Xixian New Area) and a permanent population of 12,995,900. Xi 'an is a "world famous historical city" determined by UNESCO in 1981. It is one of the important birthplaces of Chinese civilization and the Chinese nation, and the starting point of the Silk Road. Thirteen dynasties have established their capitals here in history. Xi 'an is the best tourist destination in China and one of the cities with the best international image in China. There are two and six heritages listed in the World Heritage List. Xi 'an is the first batch of national historical and cultural cities announced by the State Council. In history, more than ten dynasties have established their capitals here. It is one of the four ancient capitals in China, one of the four ancient capitals in the world, and one of the capitals with the largest number of dynasties, the longest time and the greatest influence in the history of China.