Abstract: The Ordos is located in Northern Sand Prevention Belt, it is important in the Beijing-Tianjin sandstorm source region. The sand-fixing service is great significance for building ecological security barriers in the north and maintaining the security of human settlements around Beijing-Tianjin. Based on the long time series of remote sensing images and the meteorological, vegetation, soil data, and used the revised wind erosion equation (RWEQ) model and GIS technology, and simulated the temporal and spatial patterns of Sand-fixing Service from 2000 to 2018, and discussed the different driving forces from the perspective of rainfall and land use change. The results showed that:(1) From 2000 to 2018, the average annual sand-fixing capacity of this region reached 3.853 billion tons in total, or 43.94t/ hm². In addition, the sand-fixing function showed a gradually decreasing trend from east to west. (2) In 18 years, the average annual sand-fixing function increased 4.26×10⁸ t per year. It was found that the function increased mainly in  the southeast Jungar Banner and Uxin Banner, accounting for 54.89% of the total area, while decreasing trend areas mainly distributed in the Kubuzi desert and western Otog Banner, accounting for 15.33% of the total area, and the stability areas mainly distributed in parts of Hanggin Banner, Otog Banner and the Ejin Horo Banner, accounting for 29.76% of the total area. (3) The change of sand-fixing service significantly correlated with rainfall(P＜0.01). The land use methods, such as improving desertification and Conversion of Cropland to Forest and Grassland, are beneficial to the improvement of ecological environment quality, which plays an active role in improving sand-fixing function. The results of this study have certain scientific significance for promoting ecological restoration and sustainable development.