The process of dielectrophoresis has been shown to be applicable for soil improvement. This paper presents the results of continuous investigation into factors affecting dielectrophoretic strengthening of soft clays. The results indicate that the increase in undrained shear strength and decrease in soil water content after a dielectrophoretic treatment are dominated by the type and water content of intervening media. By minimizing the space between soil and electrode and adapting a clay slurry of relatively low water contents as the medium, the process of dielectrophoretic strengthening can be enhanced.