The De'ang ethnic group is one of the indigenous peoples of Ruili. They are mainly distributed in the villages of Manghai, Guangsong, and Leigong in Huyu Township; Guangka, Leimen, and Nansang in Mengxiu Township; and Henanmao in Mengmao Town. Their residences are mostly located on the edges of basins at altitudes of 900 to 1000 meters and in subtropical mid-mountain forests, living relatively dispersedly. Their villages are often situated among the settlements of the Dai, Jingpo, and Han ethnic groups. The De'ang people are a nation that universally believes in Buddhism, and the best building in the village is the Zang House, which houses Buddha statues. Because their religious beliefs are the same as those of the Dai people, many customs are also similar, with the main ethnic festival being the Water Splashing Festival. In addition, there are the "Opening Door Festival" and "Closing Door Festival," as well as religious festivals such as "Bai."