Sihai Town, Beijing Yanqing District town, located in Yanqing District, the eastern part of the city, between longitude 116 ° 18'21" ~ 116 ° 30'47", latitude 40 ° 28'16" ~ 40 ° 37'17" east, south, west and Huairou District Bohai Town, JiuDuHe Town, northwest and LiuBinBao township as neighbors, northeast and QianJiDian township, pearl spring township connected. The town area is 116.17 square kilometers. Tomorrow Shun eight years (1464), the four seas area built the city, for the Beijing north town. During the Kangxi period of the Qing Dynasty, the Sihai area was set up as a county. In 1947, it belonged to Sihai County of Hebei Province. 1951, it was transferred to Yanqing County. 1956, Sihai Township was built. 1958, Sihai People's Commune was established. 1983, the commune was changed to a township. 1995, October 12, the township was changed to a township. 1997, August 22, Heihanling Township was annexed to the township. As of the end of 2018, Sihai Township had a household population of 6,911. As of June 2020, Sihai Township has 1 community and 18 administrative villages under its jurisdiction, and the township government is located at No. 70, North Street East I, Sihai Township. In 2011, Sihai Town produced a total of 50,000 tons of grain, 7,268 kg per capita. The total output value of animal husbandry was 13.82 million yuan, accounting for 23% of the total agricultural output value. A total of 5,645 mu of forests were reforested, with a forest cover rate of 79.4%.