The survival time of hepatitis B virus in the air is related to the outside temperature and cannot be generalized. Hepatitis B virus is the pathogen that transmits hepatitis B. It belongs to DND virus, which is mainly transmitted vertically through blood, sex and mother-to-child transmission, and the hepatitis B virus in the air will not be contagious to human beings. Hepatitis B virus can cause autoimmune response, immune regulation dysfunction, resulting in the production and release of a large number of normal or abnormal proteins from diseased liver cells. This virus has strong resistance, generally at -20℃ can survive for 20 years, at 30℃-37℃ can survive for 6 months, over 37℃ can survive for 7 days, at 65℃ can survive for 10 hours, at 100℃ will lose its infectiousness in about 10 minutes. In addition, simple hepatitis B core antibody positive is generally not very contagious, regular review can be, do not need to be treated, but pay attention to rest, avoid spicy and stimulating food, prohibit alcohol, it is recommended that every interval of 1-2 years to the hospital outpatient liver clinic recheck.