In the context of ecologically sustainable development and pluralism, ecological conservation and multi-value are clearly involved in procedures for conserving national land. From the symbiotic perspective of urban and environmental system, national conservation is concerned with pluralism, environmental planning, and group decision making. This study thus develops a framework for delineating national land conservation area and then delineates the area. Finally, areas for adjustment of the conservative policy of national land are discussed from the viewpoint of ecologically sustainable development.