用液上气相色谱法测定了298.1K下蔗糖和葡萄糖水溶液中丙酮、乙醇和乙腈的活度系数.对实验规律和3个非水组分活度系数(1nγ)随糖浓度(m)的变化,从糖分子平伏羟基(e-OH)水化和溶剂混溶序及溶质与糖分子间相互作用的角度作了初步解释. The activity coefficients of acetone, ethanol and acetonitrile in sucrose and glucose aqueous solution at 298.1K were determined by headspace gas chromatography. The experimental rules and the change of activity coefficient (1nγ) with sugar concentration (m) of three non-aqueous components From the point of view of the hydration and solvent miscibility of etalated hydroxyl groups (e-OH) and the interaction between solutes and sugar molecules.