The sources of social security funds in various countries in the world mainly include

1. The government raises funds through taxes and financial allocations for the construction and operation of the social security system.

2. Social insurance premiums: Employers and workers pay social insurance premiums, social security, medical insurance and unemployment insurance in a prescribed proportion.

3. Public welfare funds, funds, donations, etc. Some countries or regions have established social welfare funds to raise funds through charitable donations and charitable donations to support the welfare undertakings of vulnerable groups.

4. Investment income: The government or institutions publicly issue bonds and other financing instruments to the society, and the funds raised can be used for the investment of social security funds.