This paper constructed a wheat suitable assessment model for land classification and gradation，and the wheat digital fertilization technique was discussed on this basis.16 indexes were selected including the barrier layer type，draining modulus and pH，etc.And it was constructed into 5 hierarchical layers in this evaluation system.According to the integrated fertility index of cultivated land，the wheat lands were divided into four grades，that was highly appropriate area accounted for 317%of the total cultivated land，appropriate area accounted for 483%，and barely suitable area accounted for 121%，not suitable area accounted for 79%.On the basis of suitable assessment，regulation of fertilizer needed and fertilizer strategy model，the paper made two fertilizer formulas(NP2O5K2O)15-15-10，18-12-10.Practice showed that compared with conventional fertilization，recommended fertilization reduced nitrogen 55 kg/hm2，but increased N use efficiency from 332% to 377%.