Ammonium propionate can be used as antiseptic and antifungal agent. Produces free propionic acid under acidic conditions and has antibacterial effects. The lower the pH value, the better the preservative effect. Ammonium propionate is less corrosive and has good anti-mildew and anti-caking effects on grains. The feed and grain preservatives in the United States mainly use ammonium propionate, and the compound of propionic acid and ammonium propionate can exert the best anti-mildew and bactericidal effects in an acidic environment.