There are many electricity penetration methods with different characteristics for detecting the floor-water hazard in the working face. Through the laboratory test by simulating monopole-dipole method, parallel bipolar-dipole resistivity method and parallel electrical method, the authors analyzed the advantages and disadvantages of these three kinds of detecting methods so as to provide reference for detecting the floor-water hazard in the working face. The results show that the three methods have their respective characteristics and reactions to anomalies. The monopole-dipole method has less convergence of the detection results, and the quantity of data collected by this method is limited; the parallel bipolar-dipole resistivity method characterized by relatively low data-collecting efficiency and long construction time is suitable for small range exploration by collecting massive data; the parallel 3D electrical technique of lane pairs is suitable for meticulous exploration because it can collect massive data, has good convergence of the target body and can accurately determine the spatial limits of the water-bearing district on the working face floor.