With soil-resin-core equipment, the difference of nitrogen mineralization and its correlation with NO3^- - N leaching were studied. Results indicated that large changes in N mineralization, nitrate leaching and available N were found in acid purple soil for vegetable cultivation, while N mineralization and nitrate leaching varied less in the other soil. Statistic analyses indicated that the content of N mineralization significantly influenced the amount of nitrate leaching in the acid purple soil. Significant correlations were observed between N mineralization and NO3^- -N losses while there did not exist correlation in the other two soil. The results indicated that N mineralization and nitrate leaching varied with different soil types.