According to the Agricultural Encyclopedia, Dan Ling County belongs to Meishan City, Sichuan Province, located at the southwest edge of Chengdu Plain in Sichuan Basin, and within Chengdu-Chongqing Economic Zone. Dan Ling County has a mild climate and belongs to subtropical humid monsoon climate. Four distinct seasons, no severe cold in winter, no intense heat in summer, warm in spring and cool in autumn, rainy night, light wind, low light, annual average temperature 16.7℃, annual rainfall1100-1300mm, which is very suitable for citrus growth.