Normal blood is sterile body fluid, and once the blood is infected with bacteria, it often indicates an infection in the body. After the appearance of blood bacterial infection, drug sensitivity culture should be actively performed to find out whether the blood-borne bacteria originate from the respiratory tract, gastrointestinal tract, or from the urinary tract. In addition, it is also important to consider how resistant the bacteria are and the drug sensitivity results. On this basis, antibiotics are selected for treatment. In addition, antibiotics should be selected for effective coverage of regional and sectoral epidemic pathogens. When selecting antibiotics, it is also important to consider whether such antibiotics can penetrate into the tissues, as well as to consider the pharmacokinetics of the antibiotics into the body, and what adverse reactions can be caused, etc.