The Tianheng Villa Mountain project is located in the Huairou 4A scenic area in the northeast of Beijing, adjacent to famous scenic spots such as Huairou Reservoir, Hongluo Lake, Hongluo Temple, and is extremely rich in natural resources such as animals and plants. The project is built on the mountain, fully integrated with the natural environment surrounded by mountains on three sides and facing the lake on both sides, and rationally planned the buildings by using the natural elevation difference of the terrain, so that the landscape and the buildings echo each other and create a unique living environment. All use TCP/IP networked color all-digital video intercom series, with a total of 309 households.