Jiucheng Palace, located in Linyou County, Shaanxi Province, so the mountains and clear waters are beautiful, summer is not hot, winter is not cold, the climate is pleasant, at the end of the sixth century, the emperor of the Sui Dynasty personally selected the site to build the summer away from the Palace of the Palace, and the later Tang Taizong changed the Palace of the Palace to the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of the Palace of