The identification of ecological space is one of the most efficient ways to effectively maintain the ecological environment and to slow down environmental degradation. It is an important field in ecological research. Given that Beijing and Tianjin cities and Hebei Province are all deficient in natural assets, water and land resources have been under considerable pressure over the last 10 yr. In these areas, there exists an intense conflict between conserving the fragile foundations of the natural ecology and the desire for socioeconomic development. In order to explore the ecological space method and its effectiveness on sustainable development, we evaluated the importance and availability of ecological services and identified key areas of ecological functions and areas of biodiversity that would be considered a conservation priority. The Hunshandake Sandy Land, Hebei Province, an area where desertification prevention is a priority, is bordered by the Yan Mountains to the north and the Taihang Mountains to the west. The area is linked to both the water resources and the ecological security of Beijing, Tianjin, and Hebei, making desertification prevention a matter of concern within these populated regions. This study provides a scientific basis for sustainable socioeconomic development.