Legal liability for infection control from patient safety theory-Healthcare associated infection as an example. Healthcare associated infection is an infection that a patient who may be infected in a hospital due to unapproved infection control operations and may cause an outbreak event. In addition, the emergence of emerging infectious diseases (such as SARS, H5N1, H7N9 novel influenza, MERS-CoV, Ebola Syndrome, etc.) recently can cause nosocomial infection and threaten the health of the patients, their family and other employees. Reported that healthcare associated infections will increase the additional medical expenses, hospital days, mortality, etc., and bring the patient a variety of physical, health, mental harm. Medical treatment law on the hospital infection control issues, requiring hospitals to provide patients with a safe medical environment, so if the hospital and its medical staff did not follow the control obligations, resulting in outbreak infection, may be the responsibility of the legal liability.