"Shanglin" is introduced: "Shanglin" is: diameter 16.3cm, width 1.1cm, weight 0.95kg. The single string pattern is raised on the surface. As early as the Qin Dynasty, there was Shanglin Garden, but its scope was not large. It was generally located in the Hu County of Chang'an south of the Wei River in Xianyang, the capital of Qin. "The Story of Sanfu" says that Qin Shihuang built 146 villas in Shanglinyuan, including Afang Palace. According to Sima Xiangru's "Shanglin Fu", Yang Xiong's "Yu Lie Fu", Ban Gu's "Xidu Fu" and Zhang Heng's "Xijing Fu", Han Wu expanded Shanglin Garden in the 2nd year of Jianyuan (138 BC). It starts from Dinghu Palace (in today's Jiaodai Town, Lantian County) in the east, to the northern foot of Zhongnan Mountain in the south, to Zhouzhi in the southwest, across the Wei River in the north, around Huangshan Palace (in today's Mawei Town, Xingping City), and along the coast of the Wei River. East. The surrounding earth city wall has a circumference of more than 20 kilometers and has 12 garden gates. Its scope generally includes today's five counties (cities) of Lantian, Chang'an, Huxian, Zhouzhi, and Xingping and the two urban areas of Xi'an and Xianyang. Its scope is about 100 kilometers in straight line from east to west and about 30 kilometers in straight line from north to south, with a total area of ​​2,500 to 3,000 square kilometers. Such a large area is unique among royal gardens in the past dynasties. "There are twenty-six gardens, twenty palaces, and thirty-five temples." Jianzhang Palace was built in 104 BC and is the largest palace among them.