叙述了FeCl3瞬时水解法制备胶体粒子的实验方法，对溶胶中游离铁离子进行了测定，分析了样品的形貌和结构．通过对渗析过程的研究和残余铁离子百分率与FeCl3浓度关系的讨论，认为此法适合于纳米级尺寸的胶体粒子的制备． The experimental method for preparing colloidal particles by transient hydrolysis of FeCl3 is described. The free iron ions in the sol are measured and the morphology and structure of the samples are analyzed. Through the discussion of the dialysis process and the relationship between the percentage of residual iron ions and the concentration of FeCl3, this method is considered to be suitable for the preparation of colloidal particles with nanometer size.