33 dune sands and 36 section sand samples from 18 sections around Yuansha Site were collected and their grain size parameters were measured and calculated.the average particle diameter of all the samples are between 1.19-4.07 Φ with a mean value of 3.21 Φ

the samples with the average particle size of 2-3 Φ add up to 17%

while those between 3-4 Φ accounted for 77%.The sand dune mean grain size values

standard deviation value

skewness value and kurtosis value were of 2.96

0.27-1.60

-0.77-1 and 0.45-1.83 respectively

while those parameters of section samples were of 3.43

0.16-1.47

-0.78-0.12

0.67-6.29 correspondingly.Our measurement show most sediment samples can be classified into fine sand and the silver.For the formation cause

dunes samples are mainly affected by wind

sections samples are by water.Compared our measured grain size characteristics measurements with previous published work at the north as well as the south of the Taklimakan Desert

there are differences

which distinctly indicate the material source origination and the sediment mixture and sorting process discrepancy of inner Taklimakan desert.