Abstract: In order to reveal the effects of soil bulk density on the soil moisture distribution and nitrogen transportation and transformation under the film hole irrigation, the indoor experiment of soil bulk density, was done and analyzed by the non-linear regression method, empirical formulas that indicates the relationship among the variable quantity and rate of soil moisture, the conversion quantity and rate of NO-3-N and NH+4-N, and soil bulk density, the transportation and transformation time were put forward. The results showed that correlation coefficients of empirical formulas were all bigger than 0.8200, standard errors were very small, and passed the 0.05 testing significance. So the formulas can reflect the distributing character of soil moisture and the regulation of nitrogen transportation and transformation for different soil bulk densities under the condition of film hole irrigation. This research result provides references for improving the utilization efficiency of soil moisture and nitrogen.