The purpose of this study is to evaluate the suitability of land use in Nan-Gang. Owing to growing density of population in Nan-Gang, the evaluation of suitability of land use is more important. By using the analytic result of geomorphological growth curve divides the research region into unit cells and appraises in U/L ratio to investigate the suitability of land use in Nan-Gang. U/L ratio takes slope, rock characteristic, vegetation and land use type into consideration. The results are as follows: 1. There are 71.33% region of U/L ratio value under 1. It shows its land-use type is suitable. And the other region are not suitability of there land use. 2. According to the analytic result, 12.2% region in Nan-Gang is fit for urbanization. And 32.04% region is fit for agricultural production. 3. There are left only 3.07% region could be developed to urban area. But, they distribute dispersedly.