APG is a new steady-state iodine compound iodine disinfectant system. APG-PVP belong to the same non-ionic surface active agent,Itcan greatly increase the solubility of iodine in the water, and iodine in the stability under normal storage conditions, reducing the surface tension of aqueous solution. APG's own bacteria and viruses can be formed on the surface layer of a special sterilization membrane, not only can play a self-sterilizing function, at the same time can increase the permeability of iodide to enhance fungicidal activity. APG-I in the iodine with a negative one price IO3-existence of complex patterns, in which the stability of iodine ion is positive pentavalent valence state,It is a highly oxidized valence state, with the redox potential to detect the oxidative activity is normal iodine 3 to 5 times, with high oxidation activity of iodine.It has a bactericidal speed, so fish had no irritation and allergic reaction to shellfish.