Isobaric vapor-liquid equilibrium (VLE) data for 1-propanol-water system containing mixed solvent were measured in a novel ebulliometer at 101.3kPa.The experiments shows mixed solvent(ethanediol and postassium acetate) lead to eliminate the azeotropic point of 1-proanol-water system and rise the relative volatility of 1-propanol to water prominently.