Abstract: By using the method of field sampling and indoor analysis,the study on grain size characteristics of near-surface sediment in Cele desert-oasis transitional zone can provide a theoretical basis for wind-resistant desertification.The results show that along the main wind direction,from the frontier of quicksand to the edge of oasis,the particle size of sand material is gradually refined,and the separation coefficients are mainly in 1.50—1.92.Sorting medium.The skewness is between the -0.10—0.10 and the mean is nearly symmetric.The peak state value is between 0.95—1.06 and belongs to the middle peak state.There is a significant linear correlation between the surface sediment and the grain size parameters of the shrub sand.The average particle size of sand material on the surface of floating dune presents a significant linear positive correlation with the separation coefficient,and the skewness of the sand matter in the naked sandy land is negatively correlated with the peak state,and the linear correlation between the other parameters is lower.The content of clay,silt and sand particles of sand transported materials near ground surface and on the surface of nebkhas is very significant correlated with the each parameters of grain size (p<0.01),and the content of clay,silt and sand on the surfaces of bare-flat sandy land,shifting sand dunes and dustfall materials is very significant correlated with the some parameters of grain size (p<0.01).Vegetation coverage,altitude,wind power topography and spatial difference are the main factors that affect the particle size difference of surface sediment.