A study on distribution of soil available nutrients on the field scale is important for improving agricultural management,and for assessing effects of agriculture on environmental quality and degrees of the influence of some random factors,such as human disturbance of soil properties.However,soil nutrients are highly heterogeneous whether on a large scale or a small scale,and their heterogeneity results from many processes acting and interacting across a continuum of spatial and temporal scales.Due to nutrient loss along with serious soil erosion in hilly area of Three Gorges Reservior Area,some researchers have studied mechanism of soil nutrient loss and how to control soil nutrient loss,and others have explored variability of soil nutrients described with classical statistical methods.However,there is little information available on spatial variability and scales of soil nutrients in this area.Hence,spatial patterns of soil available microelements in tobacco soil were studied in Pengshui,using geo-statistics of ArcGIS.Results show available Cu,available Fe and available Mn took on normal distribution while the others were subjected to Asymmetric distribution;the coefficients of variation of soil available microelements ranged from available Mo of 29.47% to available Fe of 51.76%;global model and exponential model were applied to simulating them respectively;the random variance indexes of soil available microelements were all lower than their structural variance indexes and the available Fe and available Mn were characterized by relatively strong spatial correlation,while the others by weak one;available Cu,available Mn and available B tended to be lower,but available Mo,available Fe and available Zn were higher in content.