Geo-STATer is a computer program for semivariogram analyst,geostatistical prediction and simulation.In addition to classical statistics,it provides basic geostatistical functions,including semivariogram analysis,cross-semivariogram analysis,fitting the theoretical semivariogram or cross-semivariogram model,ordinary kriging interpolation,cokriging interpolation and inverse distance weighted method interpolation.The paper presented the system design,function and realization of this software.Taking soil data as an example,the running results of Geo-STATer were compared with those using other two geostatistical software,such as GS~ and Geostatistical Analyst for ArcGIS.The results showed that Geo-STATer had acceptable accuracy and considerable efficiency.It can be not only used to study the spatial variability of soil properties,but also integrated with other professional models for developing the precise fertilization management system.