[Objective] Based on the man-grain relationship, the spatio-temporal variation characteristics of land resources carrying capacity from 2000 to 2015 in Ordos City were studied by land resources carrying capacity model, in order to provide theoretical basis for the sustainable development of the economy and society in the fieldspathic sandstone area.[Methods] Landsat images of 2000, 2005, 2010 and 2015 were used to extract land use types in fieldspathic sandstone area. Social and economic data such as land area, grain yield and population was used. Spatio-temporal variation characteristics of land resources carrying capacity were then studied by using land resources carrying capacity model and index in Ordos fieldspathic sandstone area.[Results] ① From 2000 to 2015, the carrying capacity of land resources in Ordos shows a gradual increase trend, and the carrying capacity index of land resources fluctuated and decreased. ② Grain output showed a gradual increase trend. Man-grain relationship was basically in the state of grain surplus, and the population carrying capacity still had a certain growth space. ③ There were great differences in the carrying capacity of land resources among different districts in Ordos City. The carrying capacity of land resources in Dongsheng District and Jungar Banner was relatively higher, and the contradiction between population and grain was serious. The carrying capacity of land resources in Etok Banner and Ejin Horo Banner was medium, and the state of grain surplus existed in most years from 2000 to 2015. Etok Qian Banner, Hangjin Banner, Uxin Banner and Dalad Banner were in the state of grain surplus, and the carrying capacities of land resources were relatively lower.[Conclusion] There is still room for the carrying capacity of land resources growth in Ordos fieldspathic sandstone area, but there are great differences among different banners or districts.