A field experiment was conducted to examine the effects of nitrification inhibitor application in black soil area on soil pH,soil ammonium and nitrate change,nitrification inhibition rate,yield and nitrogen use efficiency of spring maize.Results showed that:yield of treatment of nitrification inhibitor added in fertilizer(B2)increased by 5.60% compared with nitrogen fertilization of allinone treatment(AF).The nitrogen use efficiencies of treatment of nitrification inhibitor B2 increased by 5.43% compared with that of nitrogen top dressing(TP).Nitrification inhibition was significant and production was increased. Nitrification inhibitor slowly decreased soil pH stepwise.Soil moisture content and soil NH+4-N were negatively correlated(P<001)and there was a significant positive correlation between ammonium nitrogen content and soil pH.The two nitrification inhibitors treatments,B2 and A3,had the best effects on yield increasing and nitrification inhibition.