London is a leading world-class city. It is one of the richest, most developed, most prosperous and highest living standards cities in the world. It affects the whole world in politics, economy, culture, education, science and technology, finance, commerce, sports, media and fashion, and is a model of globalization. London is the largest financial center in the world, controlling 45% of the world's foreign exchange transactions and the pricing power of commodities such as gold, silver and crude oil. It is also the largest banking, insurance, futures and shipping center in the world. The daily average foreign exchange transaction volume in London is as high as 2.7 trillion US dollars, ranking first in the world, and the total wealth of residents ranks second in the world.

Haikou consists of Hainan Island, Haidian Island and Xinbu Island, with a total area of 3 126.83 square kilometers, of which the land area is 2,284.49 square kilometers and the sea area is 86 1.44 square kilometers. Haikou was selected by the World Health Organization as the first pilot of a world healthy city in China. Haikou has the honorary titles of China's charming city, China's happiest city, China's top ten beautiful living cities, China's most investment potential city, China's excellent tourist city, national historical and cultural city, national civilized city and national double-support model city. It was awarded the annual China Habitat Environment Award by the Ministry of Housing and Urban-Rural Development, and was awarded the first batch of international wetland cities in the world by the United Nations Convention on International Wetlands in 20 18.