Legal analysis: Social security fund refers to the social security fund centrally managed by the central finance, managed by the National Social Security Fund Council, and consists of funds allocated by reducing 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.

Legal basis: Article 5 of the Interim Measures for the Investment Management of National Social Security Funds, the Ministry of Finance and the Ministry of Labor and Social Security shall formulate relevant policies on the management and operation of social security funds and supervise the investment, operation and custody of social security funds. China Securities Regulatory Commission (hereinafter referred to as China Securities Regulatory Commission) and the People's Bank of China shall, according to their respective functions and powers, supervise the business activities of investment managers and custodians of social security funds.