As the capital city of Guangxi Zhuang Autonomous Region, China, Nanning is the political, cultural and economic center. It also enjoys a name, that is, the Green City of China. In 2009, the total area of the city was 22,112 square kilometers, with a population of 6.979 million. At the end of the year, in the developed area of the city, parks, gardens and green land covered 6,491 hectares, the green coverage rate was 39.65% with a green area of 7,530 hectares, and the per capita green area was 9.9 square meters. The quality of air and water in the city hit the best record in the recent 2 decades, making a new breakthrough in the quality of the environment in the city, that is to say, the air quality in the urban area had been good for 362 days, with the good-air quality rate of 99.17%. Because of the Tropic of Cancer across the northern part of Nanning, most parts of the city are in subtropical area featuring humidity, warmth, ample sunshine, little frost and no snow. The rainfalls are between 1,241 to 1,753 mm per year, and the yearly average temperature is 21.6℃. Such climate gives Nanning such scene where trees green all year round and flowers blossom everywhere.