Protect water and soil resources, promote biodiversity protection and improve air quality. Beijing Plain is an important agricultural production base and urban agglomeration development area in China. However, due to long-term human activities and natural factors, the ecological environment in this area is facing serious problems, such as soil erosion, land desertification, water shortage and biodiversity reduction. In order to improve these problems, ecological conservation areas have been built, which can protect water and soil resources, promote biodiversity protection, improve air quality, and achieve the purpose of ecological protection and ecological restoration.