用埋入土中的等间距4个电极,测试降水入渗时土壤的电阻率变化,借以真实地反映入渗锋面的移动规律。这是近几年研制成功的一种新的测试方法。文中介绍了这种测试方法的数学方程和理论曲线,并将实际测试的曲线与理论曲线作比较,并与现行通用的电阻法对照,总结了四电极法的优缺点。 With the four electrodes at equal intervals embedded in soil, the change of resistivity of soil during rainfall infiltration was measured to truly reflect the movement law of infiltration front. This is a new test method successfully developed in recent years. In this paper, the mathematical equations and theoretical curves of this test method are introduced. The actual test curve is compared with the theoretical curve. Compared with the current common resistance method, the advantages and disadvantages of the four-electrode method are summarized.