Social security fund refers to social insurance fund, social pooling fund, individual account fund (fund in individual account in the basic old-age insurance system), enterprise annuity (enterprise supplementary security fund) and national social security fund. The social security fund, which is centrally managed by the central finance, is managed by the National Social Security Fund Council, and consists of funds allocated from the reduction of state-owned shares and equity assets, funds allocated by the central finance, funds raised by other means approved by the State Council and their investment income.

National Social Security Fund: refers to the social security fund centrally managed by the central government and managed by the National Social Security Fund Council (hereinafter referred to as the Council), which consists of funds and equity assets transferred by state-owned shares, funds allocated by the central government, funds raised by other means approved by the State Council and their investment income. Social security funds are not open to individual investors. Social security fund is a part of the endowment insurance premium paid by the state to enterprises and institutions managed by professional institutions in order to maintain and increase the value.

The sources of social insurance funds in China can be roughly divided into four aspects:

(a) the insurance premium paid by the insured according to a certain proportion of his wage income (if the wage income cannot be determined, it shall be calculated according to the average wage of the employees);

(two) the insurance premium paid by the insured unit according to a certain proportion of the total wages of its employees;

(three) the government's financial subsidies to the social insurance fund;

(4) Bank interest or investment returns from social insurance funds and social donations, etc.

Social insurance funds mainly include five categories, namely: basic old-age insurance funds, basic medical insurance funds, industrial injury insurance funds, unemployment insurance funds and maternity insurance funds. In addition to the basic medical insurance fund and maternity insurance fund combined accounting, other social insurance funds are accounted for separately according to social insurance types. Social insurance funds implement a unified accounting system throughout the country. Social insurance funds shall be earmarked for special purposes, and no organization or individual may occupy or misappropriate them in any form.

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. The sources of funds for the National Social Security Fund include financial budget allocation, income from the reduction of state-owned shares, income from lottery public welfare funds and investment income.