[Objective] In order to increase the utilization efficiency of nitrogen, reduce the leaching pollution of nitrifying nitrogen, the study explored the effect of nitrification inhibitor DCD on nitrogen transformation in alkaline soils, which may provide a reference for rational and efficient use of nitrogen and increasing crop yields.[Methods] The laboratory artificial climate chamber culture was used to study the effects of DCD on pH value, ammonia volatilization, nitrifying nitrogen and ammonia nitrogen conversion of Jincheng City of Shaanxi Province(alkalinity) garden soils in different temperatures of 15℃, 25℃ and 35℃.[Results] The result indicated that the pH value with DCD was higher than the control, which increased with the temperature increasing. The ammonia volatilization increased with the temperature increasing in alkaline soil, so the temperature increase by 10℃, the increasing rate of nitrogen loss in the form of ammonia was about 6.90%. The nitrifying nitrogen content decreased with temperature increasing, whose variation was opposite with ammonia nitrogen content. Moreover, the peak time of ammonia nitrogen content with temperature increasing was about one week ahead with the increase of temperature by each 10℃. DCD reduced the conversion of ammonia nitrogen to nitrifying nitrogen.[Conclusion] DCD can reduce the leaching pollution problems by lowering the nitrogen conversion to nitrifying nitrogen, and the pH value, ammonia volatilization and ammonia nitrogen increase with the temperature increasing.