Bacterial cultures are required when infection with certain pathogens is suspected, and drug sensitivity tests are required to identify drug resistance. Pathogen culture and drug sensitivity testing are both aids in diagnosis and treatment for clinicians. For pathogen culture, generally in the clinical such as bacterial infections need to carry out pathogen culture, especially for some unexplained fever patients, need to use pathogen culture to determine the pathogenic bacteria infected, and even need to repeat the bacterial culture, until the suspected pathogens screened out. The common ways of culture are blood culture, urine culture, sputum culture and so on. Drug sensitivity testing can help physicians choose the most appropriate antibacterial drugs; if there is a need to monitor bacterial resistance and understand the change of resistance in the region, the results of bacterial drug sensitivity assay are needed to establish a database of bacterial resistance; drug sensitivity testing is also needed for the pharmacodynamic evaluation of new antibacterial drugs.