Temperature effects on the electric characteristics were studied in a colloidal system made up of 0.05-wt.% multiwalled carbon nanotubes dispersed in the nermatic liquid crystal E7. The electric properties were observed via measurement of transient current in a homogeneously aligned liquid-crystal cell induced by a polarity-re versed field. The cell filled with the suspension and that containing pristine liquid crystal exhibited similar voltage- and temperature-dependent behaviors in the experiments. However, it was interestingly found that the transient current originating from the transport of impurity ions was remarkably suppressed in the suspension. The enhancement of the ionic mobility was also observed in such a colloidal system.