The distinctive spatial location of Qinling Mountains makes its ecological environment protection very important and indispensable. Using currently advanced GIS technology, we built the decision support system of Qinling ecological environment protection. The system not only efficiently manages spatial information, thematic information, ecological environment information and resource information, but also provides the government the decision support on ecological environment protection and shows the real three-dimension scenes to users. The article mainly introduces the design, framework and realization of the system and introduces the component of the database sustaining the system.