Songyu 419 was used as materials and a field experiment was carried out to study effects of nitrogen, phos-phorus and potassium application on grain yield and yield components of spring maize. Relationship was establishedbetween levels of fertilizer and grain yield and the maximum theoretical yield was obtained. The correlation analysisbetween the grain and yield components defined the effects of them on yield. The results proved that yield of maizewas highest, 12 243 kg/ha, under the conditions of pure nitrogen 202 kg/ha, P₂O₅97.5 kg/ha, K₂O 58 kg/ha. Basedon the results, we proposed the method of fertilizer application, i.e. keeping application amount of nitrogen stable, in-creasing phosphorus amount and reducing potassium amount under continuous cropping of maize in black soil areaand we hope that the results could provide reference for the development of high yield of spring maize fertilizationstrategy.