The theory of Human Settlement of Prof. Liangyong Wu, which proposed to emphasis integrated and comprehensive research among various discipline, has established a theoretical framework for Chinese spatial planning system. It is suggested by recent “Some Opinions on Establishment and Monitoring its Delivery of Territorial Spatial Planning System” that it is necessary to coordinate scientifically the layout of ecological, agricultural and urban functional space, to define protection of ecological environment potential areas, permanent basic cultivated lands and boundary of urbandevelopment areas in line with assessment of natural resources capacity and territorial availability of development in an order approach. This forms the basic supporting function of assessments of natural resources capacity and availability of development in the process of territorial spatial planning process, which is required to have strategic, scientific, coordinative and authoritative roles. The objectives of which are to improve and deliver strategy and mechanism of Main Functional Zone Planning, to establish spatial planning system, and to set up a sound mechanism of uses control and management. In other words, Main Functional Zone Planning is action as a leading role, while assessment of natural environment capacity and availability of development being an important fundamental work. This paper intends to explore two contents as follows: Firstly, how to deliver the leading role of Main Functional Zone Planning in the territorial spatial planning system? As mentioned earlier, the objectives of territorial spatial planning are to improve and deliver the strategy and mechanism of Main Functional Zone Planning. However, different types of Main Functional Zone Plan should offer various approach to production of territorial spatial planning. For example, the differences among four types of optimizing development zone, key development zone, restricted development zone and prohibited development zones may have different planning making concepts and leading functions. Territorial spatial planning within the optimizing development zones should be in line with spatial resources limitation; that of key development zones should emphases on both spatial and natural resources capacity; while territorial spatial planning in the restricted development zones may have to prioritize protection of environmental natural resources, and finally planning of the prohibited development zones should strictly control ecological environmental protection. It is obviously that the contradictions between “uniqueness of space” and “diversity of management” among urban land uses in different Main Functional Zones; it then illustrates the significance of assessment of availability of development territorial space according to the leading role of Main Functional Zone Planning. Qingdao has not prepared its own main functional zone plan, but in line with National Main Functional Zone Planning, Qingdao has followed the function defined by Shandong Provencal Main Functional Zone Plan. Secondly, what are the outcomes of assessment of availability of Qingdao territorial spatial development in real practices? The assessment of availability of Qingdao territorial spatial development includes assessments of importance of ecological protection, agricultural production and urban development. The assessments objectively and truly identify the regional resources and environment endowment conditions of Qingdao in line with natural resources capacities. Leading by Main Functional Zone Plan, it is able to provide guidance to the assessment of urban, ecological and agricultural importance, e.g., importance of ecological environment protection based on prioritizing on ecological resources, availability of agriculture production based on both space and resources, and availability of urban development based on spatial resources. It is able to explore the problems and potential risks of territorial spatial development and uses, to identify space of ecosystem service significance and sensitiveness. Basic supports to planning objectives depending upon varies capacity assessments are then available and sounded. It is able to define maximum capacities of ecological, agricultural and urban space that offers fundamental data and information for covering rate of forest, quantity of wood land, permanent basic cultivated land and development intensity. This work may help Qingdao to maximize its comprehensive benefits under the control and limitation of natural resources within its territory, to provide scientific basis for relevant index decomposition of territorial spatial planning, and finally to support the production of Qingdao Territorial Spatial Plan. It is the arguments of the authors that assessment of capacity for territorial spatial planning covers multiple disciplines of human settlement; it is an integrate systematical approach. It is also a process to exploration and practices of whole area and all-element territorial spatial systematic control. Assessment of territorial spatial development provides important bases not only for related controls of main function zones, but also for protected layout of optimizing territorial spatial development. It is expected and argued by the authors that leading by the strategy of various Main Functional Zone Planning, the assessment of territorial spatial development will benefit in providing technical supports to the production of territorial spatial plan, and in delivery of ecological civilization.