DMPP is a new type nitrification inhibitor and has been added in some ammonium-containing fertil-izers to reduce the transformation of ammonium to nitrate in the soil. A field experiment was carried out to investi-gate the effects of DMPP-containing fertilizer ENTEC on maize growth and nitrate leaching in alluvial soil. The re-sults showed that compared to the normal fertilizer, ENTEC application as either basal fertilizer before sowing or asside-dressing at V8 inhibited nitrification and reduced the content of nitrate in the soil, and increased the ratio ofammonium to nitrate in the soil. As a result, ENTEC fertilizer significantly promoted root growth and have no effecton the yield of maize. It is concluded that adding the nitrification inhibitors such as DMPP in the fertilizer can be away to reduce the risk of nitrate leaching without adverse effect on maize growth.