Abstract: Abstract: Improving the ecosystem service function and production function of cultivated land is the main objective of well-facilitated farmland construction, while well-facilitated farmland zoning and regulation design aimed to improve ecological service function is the fundamental premise for the effective implementation of ecological farmland construction. At present, the emphasis of well-facilitated farmland construction is to achieve the goal of good quality of cultivated land, centralized and continual cropland, infrastructure supporting, rational ecological landscape pattern and stable spatial distribution through engineering technology and other measures. On the basis of the existing goals, taking Yuzhong County, Gansu Province as a typical case, the paper tried to explore the theory and method of ecological farmland construction zoning in loess hilly region. Firstly, taking village as the basic research unit, based on InVEST model, the paper evaluated 4 different values of ecosystem services which are habitat quality, soil retention, carbon sequestration, and food supply. Then the paper analyzed the spatial differentiation of various types of ecosystem services, and found out the low-value ecosystem service types for each research unit. Secondly, the paper identified obstacle factors which affect regional ecosystem services, and divided them into controllable factors and un-controllable factors. Thirdly, through the relationship framework between well-facilitated farmland construction measures and ecosystem service functions, combined with the controllable obstacle factors, the construction directions of well-facilitated farmland in different regions are determined, as well as the measures of ecological well-facilitated farmland construction zoning and regulation. The main contribution of the paper is to discuss the relationship between well-facilitated farmland construction measures and ecosystem service functions, and to put forward a set of ideas and methods for delineating ecological well-facilitated farmland construction zoning based on ecosystem services evaluation. Results show that, Yuzhong County's ecosystem services have obvious spatial difference. Among them, the habitat quality shows a decreasing trend from southwest to northwest area. The spatial difference of soil erosion is large, which is controlled by topography and vegetation cover and other factors. The high value area is mainly distributed in the loess hilly area and the northwest area, and the low value area is mainly located in the southern mountainous area and the central valley basin area. Similar to the habitat quality, the spatial distribution of carbon sequestration services also shows spatial characteristics of decreasing from south to north. Because of the better soil and water conditions in the central valley basin, the spatial distribution of food supply services shows that it is low in the north and south mountains, and high in the central basin. On the basis of the spatial difference of ecosystem services and the identification of controllable obstacle factors, 4 zoning types of ecological well-facilitated farmland construction in Yuzhong are obtained, which are habitat quality improvement zone, food supply and carbon sequestration service promotion zone, habitat quality and carbon sequestration service promotion zone, and habitat quality, food supply and carbon sequestration service promotion zone. Corresponding regulation and control measures are put forward for different types of ecological well-facilitated farmland construction zoning. The construction division can effectively promote the ecological function of "fields, water, roads and forests", which is the effective mode to achieve the simultaneous improvement of ecological service functions and production, and it also can provide important basis for theoretical thinking and practical innovation of ecological civilization construction.