The surface activities of mixed surfactants of partially-quaternized 2-vinylpyridine telomers (xR_n-2VPQ, x is the total number of alkyl chains, n is the alkyl chain length) and monomeric alkyltrimethylammonium bromide (1R_nQ) or gemini 1, 2-bis (alkyldimethylammonio) ethane dibromide (2R_nenQ) were investigated at pH 2 by surface tension, foaming property, interfacial tension and emulsification power. The mixed critical micelle concentrations (cmcs) were intermediate between the pure component xR_n-2VPQ and 1R_nQ or 2R_nenQ. xR_n-2VPQ/2R_nenQ system was higher efficiencies in lowering the surface tension than xR_n-2VPQ/1R_nQ. The surface tension was influenced by the alkyl chain length of binary surfactants and the mole fraction (α) of xR_n-2VPQ. In particular, 2.0R₁₀-2VPQ/2R₁₀enQ system with α = 0.50 showed the lowest surface tension. The mixtures of two cationic multialkylated surfactants improved the foaming properties as compared with the pure component cationic surfactants. The similar trends in the surface tension and the foaming properties were observed for the lowering abilities of the interfacial tension at the water / toluene interface and emulsion stabilities.