Social security fund is a special fund established for the implementation of social security system in accordance with the provisions of relevant national laws, regulations and policies. Social security funds are generally set up according to different projects, such as social insurance funds, social relief funds and social welfare funds. Among them, social insurance fund is the most important part of social security fund. At present, China's social insurance funds are divided into endowment insurance fund, unemployment insurance fund, medical insurance fund, industrial injury insurance fund and maternity insurance fund. Among them, the endowment insurance fund has the largest amount and occupies an important position in the whole social insurance system.

Financing method:

1. Taxation methods: unified standards, compulsory collection and unified collection and use.

Second, the collection method: generally limited to social insurance, with certain flexibility.

3. Free financing method: it is not fixed and flexible, and comes from the voluntary participation of the public, such as issuing welfare lottery tickets.

Endowment insurance financing mode;

1. Pay-as-you-go system, equivalent to intergenerational transfer.

Second, the complete accumulation model is to determine the appropriate rate standard from the perspective of pursuing the long-term balance of income and expenditure of endowment insurance, and after macro-calculation of relevant social and economic development indicators.

Three, part of the cumulative type, with fixed income, a slight balance.