分别采用稀土合金、硼钛复合盐及硼钛中间合金对ＺＡ２７锌铝合金进行变质处理，探讨了变质剂对合金组织、力学性能的影响。结果表明，稀土合金能细化晶粒，改变组织的分布状态，使合金的强度、塑性、韧性有一定程度的提高。当添加稀土量大于０．０８％，则形成（ＲＥ，Ｃｕ）Ａｌ４Ｚｎ７化合物，使强度、塑韧性下降。硼钛中间合金易引起偏析及遗传等不利影响。而硼钛复合盐能有效地细化ＺＡ２７的初生α相晶粒，显著提高合金的强度及塑韧性，是三种变质剂中效果最好的一种。 The rare earth alloy, boron-titanium composite salt and boron-titanium master alloy were respectively used to modify the ZA27 zinc-aluminum alloy, and the effect of the modifier on the microstructure and mechanical properties of the alloy was discussed. The results show that the rare earth alloy can refine the grains and change the distribution of the microstructure, so that the strength, ductility and toughness of the alloy improve to some extent. When the amount of added rare earth is more than 0.08%, the (RE, Cu) Al4Zn7 compound is formed to lower the strength and the toughness of the plastic. Boron titanium master alloy easily lead to segregation and genetic adverse effects. The boron-titanium composite salt can effectively refine the primary α-phase grains of ZA27, significantly improve the strength and plasticity of the alloy, is the best of the three modifiers.