Xian, also named Chang'an in ancient times, is an eternal city, recording the great changes of the Chinese nation just like a living history book. Xian is regarded as one of the birthplaces of the ancient civilization in the Yellow River Basin area of China. In the history of 3,100 years, Xian was the capital cities of 13 dynasties such as Western Zhou (11th century BC - 771 BC), Qin (221 BC - 206 BC), Western Han (206 BC - 24 AD).