Changshu oxidation can be divided into DC anodizing, AC anodizing and Pulse Current Anodizing according to the mode of current supply. Among them, DC anodizing is most used, and Pulse Current Anodizing has the most development prospect because of its high film growth efficiency, uniform and compact, and good corrosion resistance.

Changshu oxidation can be divided into inorganic acid anodizing such as sulfuric acid and phosphoric acid according to the composition of electrolyte. Although a certain color tone can also be obtained in these electrolytes, this color tone is single. The anodic oxide films of different hues can be obtained by changing the time and current in some electrolytes dominated by sulfonic organic acids. Simple organic acids such as malonic acid and oxalic acid can also obtain a changing tone under the action of different voltage and electrolysis time.

Changshu oxidation can be divided into ordinary film, hard film, porcelain film, barrier film with semiconductor effect and Ruby film according to the film properties. Different coatings correspond to different electrolyte and anodizing process conditions and methods.