The hazards of hepatitis B are roughly the following: 1, hepatitis B virus is contagious, mainly through blood transmission, sexual transmission and mother-to-child transmission, invisible infection is common, easy to cause infection to spouses, children and other members. 2, hepatitis B virus carriers can develop hepatitis, liver failure, long treatment time, expensive, resulting in psychological and economic burden. Most of the hepatitis B infections in childhood are easily chronicized, and some patients can develop into cirrhosis or hepatocellular carcinoma, i.e. “hepatitis three steps”: hepatitis, cirrhosis, hepatocellular carcinoma, which endangers life. 4, because hepatitis B is a contagious disease, there is a certain impact on the engagement of certain jobs, and easy to produce low self-esteem. 5, hepatitis B virus carrier symptoms are not limited to the liver itself, but can also cause a variety of other diseases, such as hepatitis B virus-related nephropathy.