Based on densification and surface coating using the electro-migration reaction of silicate ions, the effects of mortar properties, such as the ratio of water to binder, mineral admixture, curing period, and thickness of the specimen, on the surface coating layer thickness, compressive strength, flexural strength, and resistivity of treated mortar specimens were investigated. The results show that the produced coating layer thickness, compressive strength, flexural strength, and resistivity of the specimens increase with the decrease of the ratio of water to binder and the increase of the curing period. The coating layer thicknesses and resistivity of mortar specimens with different admixtures follow an order of silica fume > slag > control (without admixtures) > fly ash. The times corresponding to the appearance of the resistivity peak of the specimens with silica fume and slag are shortened compared with that of the control specimen. The increments of compressive and flexural strength of the mortar specimens with silica fume are higher than those of the control mortar specimen. However, the addition of fly ash exerts little influence on the compressive strength and flexural strength of electrochemically treated specimens. The thickness of mortar specimens has little influence on the properties of electrochemically treated mortar specimens.