Levofloxacin has excellent in vitro activity, less side effects, high safety and good pharmacokinetic properties than ofloxacin. It can be widely used in respiratory tract infection, gynecologic disease infection, skin and soft tissue infection, surgical infection, biliary tract infection, sexually transmitted diseases, otorhinostomatology infection and other bacterial infections, which is a broad-spectrum fluoroquinolone antibacterial drug used orally or in the stomach.