中文摘要：

粒子达到纳米级时，将具有量子尺寸效应、小尺寸效应、表面效应和宏观量子隧道效应，因而表现出许多特有的性质，具有广阔的应用前景。本文介绍了纳米铁的各种制备方法，并阐述了各种制备方法的优缺点。

英文摘要：

When the size of a particle reaches nanometer magnitude, it has quantum-scale effect, small scale effect, surface effect and macro-quantum tube effect. Therefore, it exhibits a lot of unique properties and has extensive application prospect. The paper introduces all kind of preparation methods of nanometer-iron particle, then expatiates advantages and disadvantages of these methods.