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阐明了湿化学法制备纳米粉的热力学条件以及如何借助于材料的腐蚀状态图（E-pH图）确定沉淀成胶条件。实验结果证明，这种方法具有简单、直观、快捷等优点，不但可以方便地确定单组分沉淀成胶条件，而且对多组分共沉淀条件的确定具有更显著的优越性。
The thermodynamic conditions for the preparation of nano-sized powders by wet chemical method are elucidated and how to determine the conditions for the precipitation of gel by means of the E-pH diagram of the material. The experimental results show that this method has the advantages of simple, intuitive and fast. It not only can determine the conditions of single-component precipitation gel easily, but also has more remarkable superiority for the determination of multicomponent coprecipitation conditions.