Abstract: The assessment on suitability of land resources is the base for land exploitation and arrangement. Unused land that is the primary object of land exploitation and arrangement has special natural and economic characters. The assessment on suitability of unused land resources is the key work in land exploitation and arrangement. Firstly, the unused land assessment method based on Geographic Information System is designed in the paper.Further,expounding the course of assessment from four aspects:(1)the method of choosing assessment cells and creating technique in computer; (2)selecting assessment factors and assessment index system; (3)ensuring proportions of assessment factors by the means of Delphi and mathematics model ; (4)the course of land assessment. Lastly, the application for the landsystem is made through the unused land assessment of Liucheng County, the assessment result can be quickly displayed on the map, providing some feasible advice for land using.

Key words: unused land resources, suitability evaluation, GIS, Liucheng County