Abstract: There are some sand cemented bodies naturally distributed on some inter-dune corridor in central Taklimakan Desert They form a special large granular layer covering the sand surface together with coarse sand and very coarse sand. Field investigation and sampling analysis indicate that the grain diameter of sand cemented body is uniform, the size can reach the level of coarse sand, very coarse sand and gravel. The diameter of larger ones is more than 10 mm, and the diameter of maximal one is up to 23.5 mm. The shapes of sand cemented bodies are very diverse and irregular. It is very hard and can't been crumbled and even not scattered with water soak. Its specific gravity is about 2.51 g·cm^-3, less than gravel and local dune sand. The salt content of sand cemented body is so high that its electrical conductivity can reach 2.56 ms·cm^-1 just like heavy saline soil. Its ingredients in its water extract of crushed material are dominated by calcium sulphate. It is in neutral conditions with pH value of 7.40. The gravel-size sand cemented body lies on the sand surface with a density of 807 particles per a square meter and its coverage can reach 2 to 3 percent. Due to its main features similar to gravel, we can supposed that sand cemented body has an effect on aeolian process like gravel. The sand cemented bodies are a natural sand-fixation material. To study the formation mechanism will help to develop new types of sand-fixation technology and sand-fixation products. It should play an important role in some key aeolian processes such as wind erosion control, sand transport regulation, dune morphology revolution on inter-dune corridors in the Taklimakan Desert. So the research on the effect of sand cemented bodies on windblown sand movement is of great academic significance to understand the relative stability mechanism of sand surface on some inter-dune corridor in the Taklimakan Desert. The formation of sand cemented bodies must concerned with a special geological history background, so they can be used as an evidence reflecting the historical of climate changes in the Taklimakan Desert. So the sand cemented bodies deserve further research for its value in basic theory research and practical application.

Key words: sand cemented bodies, grain size, chemical composition, sand fixation, sand surface relative stability, climate change