The significant eco-function area is a new concept, which is put forward by the department of environment management in recent years. It plays more and more important role in protecting national and regional ecological security. Analyzing the spatial transfer characteristics of ecosystem services of the significant eco-function area is the basic work of strengthening the regional ecosystem management and establishing the policy of ecological compensation. Based on the review of progress of ecosystem services research, the concept of ecosystem services radiation effect is put forward and the connotation of sand-fixing function and its radiation is emphasized and analyzed in this paper. The significant eco-function area in the lower reaches of Heihe River is one of planed eco-function area of primary sand-fixing function in China, which is in west Inner Mongolian Autonomous Region. The area is one of four main sand land and dust sources in China, so it is very important to quantitatively analyse the sand-fixing function and its radiation benefit. Using the TERRA-1 MODIS 250m 250m NDVI time series data on July, 2006, under the supporting of GIS, using the wind erosion and sand transporting models, the radiation benefit of the sand-fixing function was evaluated. The results show that the amount of sand-fixing is 1.499×108t in 2006, the sand-fixing of the low covered grassland is the biggest and occupies 80% of the total, the sand-fixing of the shrubbery land is secondly and occupies 12.5% of the total, the sand-fixing of the forest land is smallest and only 320×104t; as a whole, the sand-fixing ability is lower, the sand-fixing per unit area of the different vegetation cover is very different, the forest land is 22695t/ km2 and highest, shrubbery land is 22605t/km2 and secondly, and the low cover grassland is only 12338 t/km2 and smallest；the radiation scope of regional sand-fixing function for the sand diameter between 10μm and 20μm can reach 15 provincial districts, such as Beijing, Tianjin, Hebei, Shandong, and so on, and the sand-fixing function radiation covers a total area of 115.3×104km2.But the radiation scope of regional sand-fixing function for the sand diameter between 20 m and 400 m only can reach Alashan Left Banner and Alashan Right Banner in Inner Mongolia, and the sand-fixing function radiation covers a total area of 5.2×104km2.The radiation amount of the leeward region is 5996×104t,which is equivalent to 49.8t per square kilometer. Its direct radiation benefit is 89.94×108 Yuan RMB (1.3 billion ＄) which is 8.6 times as much as the GDP of the study area in 2006. The spatial distribution of radiation benefit is of huge difference because of the different area of radiation regions. The Inner Mongolian Autonomous Region gains the biggest radiation benefit, which is 30.40×108 Yuan RMB and occupies 33.8% of the total radiation benefit. The Shanghai City gains the smallest radiation benefit and only occupies 0.11% of the total. There are some limitations in this research because of data and method restriction. So the more in-depth studies should be carried in the future such as the ecological mechanism, the indices and methods of ecosystem services radiation, and the indirect social benefits of ecosystem services.