Effects of a series of n-alkanol additives on the phase stability of methanol-straight-run gasoline blends were studied by testing phase separate temperature of these blends and analyzing linear regression equation of curves related with n-alkanol amount-phase separate temperature. Results show that the positive effects of C4-C10 n-alkanol on the phase stability of methanol-straight-run gasoline blends are better than that of low carbon number alcohol. Those effects are relative to HLB values of n-alkanol and the volume fraction of methanol (MVF) in the system. The most effective additive to maintain a stable system for M15 and M85 blends (MVF of 15% and 85%, respectively, following the same) is n-hexanol, so does n-decanol for M30, M50 and M65 blends. Under medium MVFs, for blends with same MVF, its phase stability can be improved with the decrease of w-alkanol HLB value; for blends with high MVF or low MVF, there is always an optimum n-alkanol HLB value to maintain a stable system. For systems adding the same w-alkanoU with the increase of MVF in the blends, the phase stability of the system weakens gradually.%通过测定甲醇-直馏汽油体系的相分离温度,考察一系列正构醇助溶剂对甲醇-直馏汽油体系相稳定的影响；结合醇加量-相分离温度曲线线性回归方程,对其影响规律进行探讨.结果表明:C4～C110正构醇对甲醇直馏汽油体系的相稳定作用效果远好于低碳醇,并且该相稳定作用还与正构醇的HLB值以及体系中甲醇所占比例有关；在M15和M85(甲醇体积分数分别为15％和85％)体系中以正己醇作用效果最好,在M30,M50,M65(甲醇体积分数分别为30％,50％,65％)体系中以正癸醇作用效果最好.在适中的甲醇比例范围内,随着正构醇HLB值的减小,其对相同甲醇比例的甲醇-直馏汽油体系相稳定作用增强,当甲醇比例过高或者过低时存在一个对体系相稳定作用最佳的正构醇HLB值；随着体系中甲醇比例的增大,同一正构醇对体系相稳定作用逐渐减弱.
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