This paper deals with the microstructure and property of zinc based composites ZA27Six under the treatment of the sodium salt and the rare earth. The test material was prepared with pure zinc ingot (Zn≥99.99wt %) and the Al-Si matrix alloy. Basic composition of the test sample was Al (25~30 wt %), Si (2.5~6.0 wt %) and Zn for the rest. Impact toughness test, tensile test and wear test were conducted. The test results show that under the treatment of sodium the massive primary silicon crystal can transform to nodular silicon on which eutectic silicon crystal can form and grow in rod-like. It is also found that the combined effect of rare earth and sodium salt can obviously refine the silicon phase and the zinc based composites enhanced by nodular silicon has better hardness and wear- resistance.