Xi 'an, known as chang 'an and haojing in ancient times, was the starting point of the ancient silk road. Located in the central guanzhong plain, north near the weihe river, south qinling, eight water run chang 'an. It is the capital with the most dynasties, the longest history and the greatest influence in the history of China. It ranks first among the four ancient capitals of China. It is the birthplace of Chinese civilization and the cradle of the Chinese nation