Chloro-iridium acid solution in the application of titanium anode, used for electrochemical processing, electroplating or other related surface treatment. By soaking the titanium anode in chloro-iridium acid hydrochloric acid solution, and then through a specific electrochemical process, the surface can be modified or covered, thereby improving the performance, stability, and corrosion resistance of the titanium anode, making it more suitable for specific electrochemical applications.