Abstract: According to the field level Oo nonfertilization treatments from 89 N.P.K fertilizer trials on rice, the paddy soil was divided into 5 fertility grades in Fujian.In the same soil fertility grace, the regional fetilizer response models were established by the average yield of the same treatment in different sites.Based on the regional fertilizer response models that was the typical model or non-typical mode, the optimum fertilizer application rate in different soil fertility grades were recommended by the marginal yield method and yield freguency analysis method respetively.The thirty-two test and verify trials showed that the rice optimum fertilizer application rate in different fertility grades may increase 405-600kg/hm2 rice yield and 352-399 yuan/hm2 net income more than fanner’s practice in average.