As one of the most common photocatalysts,Nano--ZnO is widely used in waste water treatment and air purification. It has broad prospects in environmental protection. This paper summarizes some kinds of preparation methods of Nano-ZnO, analyses the advantag%指出了纳米ZnO作为一种常见的光催化剂，被广泛应用于水处理及室内空气净化，分析了其在环境保护方面的发展前景，探讨了几种纳米ZnO的制备方法，并阐述了不同方法的优缺点，对ZnO制备方法进行了总结和展望。
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