The water in Dinghu Spring comes from Dinghushan, the first national nature reserve in China. Dinghushan is located at 23 09' 21"~ 2311'30" north latitude, where the mountains are beautiful and the ancient trees are towering, and it is known as the green pearl on the Tropic of Cancer. Dinghu Spring, represented by Longtan Waterfall, is known as "the first spring in Lingnan". Dinghushan, as the first famous mountain in Guangdong, is lush and green, and is known as the precious "natural oxygen bar". The concentration of negative oxygen ions in the air is as high as 125000 /cm 3, and the forest coverage rate is over 78.8%. It was highly praised by Academician Zhong Nanshan as "negative ions wash the lungs and make the mountains and rivers happy". The content of negative ions ranks first in China,125,000 /CM3, enjoying the reputation of "natural oxygen bar", all the Ci values of air quality evaluation index are >: 1.0, and all the test results of air cleanliness are "A-class high cleanliness", that is, the best level, and the forest coverage rate is 95%. Rich in plant resources, pleasant scenery in four seasons and abundant rainfall. Dinghushan Tianhu is the exclusive water source. Good water makes people live longer. Dinghu District, where Dinghu Mountain is located, enjoys the title of "China Dinghu World Longevity Hometown". More than 20 experts from the International Health Assembly unanimously recognized that Dinghu District has the basic characteristics of the hometown of longevity and meets the standards of the hometown of longevity. This is a good place of "Yi Yang, Yichang, Yi Yan, Yichang, Mu Yi, Anyi and Yixin".