This work provides a method to explore the transport property of the electrolyte aqueous solutions with one or two ionic liquids, especially focus on their electrical conductivity. The conductivities were measured for the ternary systems NaCl-[C(6)mim][Cl] (1-hexyl-3-methylimidazolium chloride)-H2O, [C(6)mim][BF4]-[C(6)mim][Cl]-H2O, NaNO3-[C(6)mim][BF4](1-hexyl-3-methylimidazolium tetrafluoroborate)-H2O, and [C(4)mim][BF4] (1-butyl-3-methylimidazolium tetrafluoroborate)-[C(6)mim][BF4]-H2O, and their binary subsystems NaNO3-H2O, NaCl-H2O, [C(6)mim][BF4]-H2O, [C(6)mim][Cl]-H2O, and [C(4)mim][BF4]-H2O, respectively. The conductivities of the ternary systems were also determined using generalized Young's rule and semi-ideal solution theory in terms of the data of their binary solutions. The comparison showed that the two simple equations provide good predictions for conductivity of mixed electrolyte solutions and the mixed ionic liquid solutions based on the conductivity of their binary subsystems. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.