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土壤水分运动参数的确定对土壤水分研究具有重要意义。野外测定土壤水分运动参数理论上可以使用瞬时剖面法，但是该法在野外实施时遇到许多困难。作者利用自己研制的高精度野外下渗仪，结合γ透射法测定下渗剖面、张力计测量原状土壤水分特征曲线，所得试验数据根据瞬时剖面法原理计算出导水率Ｋ（θ）、扩散率Ｄ（θ），通过水量平衡分析验证，使参数的可靠性、正确性得到了保证。
The determination of soil water movement parameters is of great significance to the study of soil moisture. In the field, the instantaneous profile method can theoretically be used to determine the parameters of soil moisture movement, but the method has encountered many difficulties in the field. The author uses its own developed high-precision field infiltration meter, combined with γ-transmission method to measure infiltration section, tension meter to measure undisturbed soil moisture characteristic curve, the experimental data obtained by instantaneous section method to calculate the water conductivity K (θ), the diffusion rate D (θ), through the water balance analysis and verification, the reliability of the parameters, the correctness has been guaranteed.