Chengdu, as a city, is a great miracle in the history of the world cities, because its city site has never been moved and has been robbed for a long time. The ancient Chengdu has won many praises in its development. In the Eastern Han Dynasty (AD 25-22), because of the developed brocade, a special organization "Jinguan" was set up to manage it, so it was known as "Jinguan City" (referred to as "Jincheng"). At the end of the Western Han Dynasty (AD 8), Chengdu, together with Luoyang, Handan, Linzi and Wancheng, became one of the five largest commercial cities in China. After the Five Dynasties, the Emperor of Shu (933-965 AD) planted hibiscus all over the city wall, so it was also called "Furong City" (referred to as "Rongcheng"). By the Song Dynasty (AD 96-1279), because of its comprehensive economic level, it was ranked among the best in the country. At that time, people also had the evaluation of "promoting one and benefiting two", which was just as famous as Yangzhou, which had the advantage of shipping and trading ports. Since Li Bing, the prefect of Qin and Shu, presided over the construction of the world-famous Dujiangyan water conservancy project more than 2 years ago, Chengdu has been known as the land of abundance since then.