[en] Dispersion relations of electron waves of small amplitude in a plasma of two-temperature electrons are studied theoretically. Addition of small amount of hot electrons to the plasma increases the damping of electron plasma wave. For the temperature ratio of six, when the density of hot electrons exceeds about four percents, the wave separates into two modes. One is the plasma wave of cool electrons when ω >= ωsub(p) and merges in one of higher-order modes when ω < ωsub(p). The other mode which is cut off at ω = ωsub(p) also merges in higher-order modes when ω >> ωsub(p). The non-dispersive mode when ω < ωsub(p) has much larger damping rate than the similar mode in the plasma of Maxwellian and water-bag electrons. (author)