Abstract: The high-resolution spatial distribution information of soil fertility contributes to the accurate improvement of forest quality. Based on the digital soil mapping technology, the main soil fertility factors were mapped digitally in the Gaofeng Eucalyptus Forest Farm of Guangxi. The grey correlation model was applied to comprehensively evaluate the spatial distribution of soil fertility under eucalyptus plantation based on GIS and digital soil mapping technology. About 68.6% of the total area was at 2-3 grades of soil fertility, 26% at 1 and 4 grades, and only 5.4% at 5 grades. The spatial auto-correlation of soil fertility index was strong. The soil fertility evaluation method proposed in this paper can realize the accurate evaluation of spatial distribution of forest soil fertility quality, and can provide a basic data support for the accurate management of forest quality.