Abstract: Aiming at the optimal fertilization strategy for the alluvial soil and lime concretion black soil in summer maize season, an experiment was carried out to study the impact of Biochar/DCD on NO3--N leaching and crop yield. Results indicates that in alluvial soil, in 25% nitrogen reduction treatment (N0.75), treatment with nitrification inhibitor (DCD) and biochar treatments could decrease NO3--N leaching by 40.8%, 31.5% and 19.0%, respectively, compared with conventional fertilization treatment(N1); as to lime concretion black soil , N0.75 and Biochar treatments could reduce NO3--N leaching by 16.5% and 34.7%, respectively, but DCD makes no difference. The yield of N0.75 treatment is lower than N1 treatment in alluvial soil and lime concretion black soil, but the difference is insignificant, which shows that appropriate nitrogen reduction is practicable. In conclusion, N0.75 and Biochar treatments are not only able to reduce NO3--N leaching losses, but also able to get an appropriate yield in both alluvial soil and lime concretion soilwhile DCD has the same effect in alluvial soil at the same time. All of the aforementioned fertilization measures are applicable in Huai River basin. However, it’s worth further research whether the combination of different treatments could balance the risk of N leaching and the crop yield.