Guangzhou is the capital of Guangdong Province, a national central city, a megacity and the seat of the Southern Theater Command. The State Council is an international metropolis, an international business center, an international comprehensive transportation hub, a national comprehensive gateway city and a national historical and cultural city. Since the Qin Dynasty, Guangzhou has been the political, military, economic, cultural and scientific and educational center of southern China. Guangzhou became the main port of the Maritime Silk Road in 1930s, the largest port in China in Tang and Song Dynasties, and the only foreign trade port in China in Ming and Qing Dynasties. Guangzhou was rated as the first-tier city in the world by GaWC, one of the most authoritative research institutions of world cities. Five times by Forbes as the best business city in Chinese mainland. The economic development capacity of Guangzhou headquarters ranks among the top three in China, with 27,000 foreign-funded enterprises investing in Guangzhou. There are 288 Fortune 500 enterprises, of which 120 have their headquarters or regional headquarters in Guangzhou.

Panyu District: Located in the south-central part of Guangdong Province, in the geographical center of Guangzhou, Hong Kong and Macao, it is bordered by Haizhu District of Guangzhou in the north, Shiziyang in the east, Dongguan City, Nanhai District of Foshan City, Shunde District and Zhongshan City in the west, the Pearl River Estuary in the south and Nansha District in the south. With a total area of 529.94 square kilometers, it governs 6 towns, 10 streets, 177 administrative villages and 84 community neighborhood committees, with a registered population of 806,000 and a foreign registered population of1130,000. Panyu was founded in the thirty-third year of Qin Shihuang (2 14 BC).

Dashi Town: Located in the north of Panyu District, Guangzhou. It is also the "bridgehead" of Guangzhou's "south extension" development strategy. Haizhu District faces Li Jiao Waterway in the north, chencun waterway in the west and Heping Town in Fangcun District of Nanhai, Zhongcun Town in the south and Nancun Town in the east. The jurisdiction covers an area of 45 square kilometers. The town is composed of "one place and two continents" with developed land and water transportation. The town has jurisdiction over 23 villages and 6 neighborhood committees.

Postal Code: (English: postal code, also known as postal code) is a coding method for a country or region to divide the whole country in order to realize the automation of mail sorting and the digitalization of postal network, and to speed up the delivery of mail. Postal coding system has become one of the standards to measure a country's communication technology and postal service level. Postal code usually consists of Arabic numerals, which represents the special code of the post office that delivers mail, and is also the communication code between residents and units within the delivery range of the post office. Postal code is a special code for postal communication to realize mail sorting, and it is a necessary tool to realize postal modernization. The ultimate goal is to improve the speed and accuracy of your letters in the delivery process, so be sure to indicate the postal code when handing in letters and parcels. In order to realize the automation of mail sorting and the digitalization of postal network and speed up mail delivery.