It is a long-acting oral quinolone antimicrobial. By inhibiting bacterial DNA cyclotron enzyme, make bacteria stop growing and play an antibacterial role. It has wide antibacterial spectrum, high efficiency, safety, stable metabolism and good tolerance. Because there is no cross action with theophylline, it is not contraindicated for asthmatic patients, so it is especially suitable for the elderly to use. It can be used for respiratory tract infection, sepsis, enteritis, urinary tract infection, gynecological disease infection, eye and mouth infection, and can also be used to prevent infection after operation.