Sanya is a coastal city nestled in tropical rain forest and lush mountains. It boasts a superb ecological environment.. With 66 percent of forest coverage,Sanya has about 3 hundred hectares forestland and 60 thousand hectares area closing hillsides to facilitate afforestation. There are 10 national,provincial and municipal level nature preserves with 13,771 hectares. The forest coverage of the urban of Sanya is 44.9%,and the average public green land is 18.9 square meters. The quality of air and environment of Sanya ranks the first place in China. According to the air quality appraising over 148 cities of 45 countries by the United Nations from 1998 to 2003, Sanya ranks the second place in China. According to the air quality appraising over 148 cities of 45 countries by the United Nations from 1998 to 2003,Sanya ranked the second place in the world. According to a general survey,life-span of Sanya people is 73.5 year. It is the place where people live longest in China.