Medical insurance is not equal to social security, but a part of social security, which is the abbreviation of medical insurance. Social security includes endowment insurance, medical insurance, industrial injury insurance, unemployment insurance and maternity insurance. Social insurance is a social and economic system that provides income or compensation for those who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons. The social insurance plan is organized by the government, forcing a certain group to use part of its income as social insurance tax (fee) to form a social insurance fund. Under certain conditions, the insured can get fixed income or loss compensation from the fund. It is a redistribution system, and its goal is to ensure the reproduction of material and labor and social stability.