Guancheng Subdistrict  Guancheng Subdistrict (, a genus of sedges") is a subdistrict in Guangdong Province, China under the administration of Dongguan City. It has an area of and a residential population of 230,000, of which 152,000 are new residents. Guancheng Subdistrict in Dongguan City has a history of some 1300 years, stretching back to 757 AD in the Tang Dynasty. Many culture relics remain. The Ke Yuan () is the most famous Chinese garden in Guangdong. The gate tower, Ying'en Men (迎恩门), was built in the Ming Dynasty and has a history of more than 600 years. The Quejin Stele () is a good scenic spot in Dongguan City, which bears testament to the Chinese people's sense of justice and probity when they had trade relations with Thailand during the Ming Dynasty. Guancheng Subdistrict gathers talented people, fortune and information together. It's a subdistrict connected with both traditional and modern trade, which provides a stage for secondary industries. It is located to the mid-west of Dongguan City and the northeast of the Pearl River Delta, on the route between Guangdong and Hong Kong. Guancheng Subdistrict used to be the political center of Dongguan City. The following is the list of political office-holders of Guancheng Subdistrict:  Guancheng Subdistrict's three important business districts are:  Guancheng Subdistrict is the center for medical and health services in Dongguan City. There are many large integrated medical institutions, including:  Guancheng Subdistrict is located in the center of downtown Dongguan, which is an educational, political and economic area, and has long cultural history. There are a university, three senior high schools, three technical secondary schools, eight primary schools and 19 kindergartens. Among these schools, there is the best senior high school with hundreds years. Also, the only one university with high level science and engineering university locates in Guancheng Subdistrict. Educational institutions of Guancheng Subdistrict include:  This stele is located on Guangming Road outside the North Gate of Guancheng Subdistrict. It was established from 1541, Ming Dynasty Jiajing. It is well-preserved. Quejin Stele recorded Li Kai, the Yin () of Panyu County (), dealing with the businessmen from Siam (now Thailand) without any payment during Ming Jiajing.