China's urbanization has started to rapidly encroach on the most valuable arable land resources and rural settlements, and it has therefore become extremely urgent to protect basic farmland, rural areas and agricultural space. However, for a brand-new round of territorial spatial planning at city and county level, with "the evaluation of resources and environmental carrying capacity and territorial spatial development suitability" which plays a fundamental role in spatial planning, emphasis is only placed on basic farmland and food production in agricultural areas. Therefore, the purpose of this paper is to optimize the theoretical and technical scheme of evaluation of "superior agricultural space", in order to serve as a foundation for protecting agricultural space, all agricultural producers and large rural areas. The technical methods employed in this paper are as follows. (1) A total-region and total-factor evaluation of suitability for farming, animal husbandry and fishery production is conducted outside the area of vital importance for ecological protection and the area of the ecological red line, dividing the space into "suitable regions for agricultural production" and "unsuitable regions for agricultural production". (2) Based on the evaluation principles of high stability, large-scale management and land connectivity, a TOPSIS model is constructed in order to further evaluate and demarcate suitable regions for producing grain and other important agricultural products and for producing special local agricultural products. (3) Based on the aforementioned points, superior agricultural space is identified by a multi-factor comprehensive evaluation procedure, taking characteristic and important rural areas and large agricultural infrastructure into consideration. The two cases in Shenyang and Wenzhou are adopted as examples for the study in order to demonstrate the validity, feasibility and practicability of our method. It is also proven that the evaluation and delineation of the superior agricultural space can assist the development and protection of territorial space at city and county level.