Abstract: Based on the land suitability evaluation, with the spatial analysis method of GIS the natural quality index, the comprehensive suitable degree and relative suitable degree of land resources were studied. The current land use map and suitability evaluation map were analyzed contrastively using GIS spatial analysis function. The diversity and important value of unsuitable land resources were calculated based on the spatial analysis. The optimal allocation scheme was finally completed following the adjustment principle of unsuitability land resources, which is established based on the diversity and important value. The optimal allocation results show the optimized agricultural land areas reduced by 10994.82 hm² compared with the current agricultural land areas; forest and grazing land areas increased by 13083.56 hm² compared with the current conditions; uncultivated land areas reduced by 1438.83 hm².