Spatial variability is one of the most important characters in soil.We use the principle and methods of traditional statistics and geostatisitcs to study the spatial variability of top soil(0~20 cm) moisture and soil bulk density in three different stand age of Salix psammophila in inter-dune lowland.The result showed that there showed increased tendency of top soil moisture with the growth of Salix psammophila

it also had a significant effect(p<0.05) on top soil moisture in three different stand age of Salix psammophila

but the soil bulk density of top soil didn't showed the significant effect.Semivariogram analysis demonstrated that the spatial variability became higher in top soil moisture and soil bulk density

higher the spatial autocorrelation which caused spatial heterogeneity mainly and more complicated and scattered according to the growth of Salix psammophila.But there is not significant different(p>0.05) between the vary function of top soil moisture and soil bulk density in different stand age of Salix psammophlia.