Tianzhu is located in the northeast suburb of Beijing, bordering Chaoyang District, 15 kilometers away from the urban area, 1.6 kilometers away from Shunyi District, and its north-south length is about 8.4 kilometers. It is about 6.6 kilometers wide from east to west, with a total area of 42 square kilometers. Because the Capital International Airport is located in it, the whole area is similar to a "concave" shape, with a flat terrain and an altitude of 24-31 meters. It belongs to the continental monsoon climate zone with obvious temperate monsoon semi-humid and semi-arid, with an average annual temperature of 14.1℃ and an average annual precipitation of 523.2 mm. Wenyu River, Xiaozhong River and irrigation and drainage channels flow through this area, and the groundwater resources are rich, with an underground area of 15 meters.