Abstract: Objective :The resistivity tomography method has been widely applied in virtue of high density, high resolution and so on. It also has a good future on detecting leakages of dams. Meterials and Methods : Through analyzing the popular models of leakages of dams, the paper introduces the methods of work and interpretation on resolving leakages of dams. Result : Finally, using 3-D finite element method to model the leakages of an embankment dam,for example. Conclusion : Interpreting the result of modeling, it gets a satisfactory effect.