The principle of safety means that the expected return of social security fund investment should be based on risk-free or as low as possible. When high profits conflict with safety, safety should be considered first. This makes the selection of investment projects strictly abide by the relevant national policies and regulations.

2. The principle of profitability

The principle of profitability means that the investment of social security fund must realize the preservation and appreciation of the fund, and take the appreciation as the goal. Therefore, social security funds should focus on long-term investments, not short-term and risky investments. While considering profitability, we should also consider the social benefits of its investment, so that its investment projects can meet the government's policy objectives and give full play to the maximum social and economic benefits.

3. Liquidity principle

Liquidity refers to the liquidity of an investment without losing its value. Due to the need to pay insurance premiums or insurance fees, the investment must be able to raise funds, realize cash and turn around quickly, and there can be no interruption or delay in the payment of funds. Therefore, the proportion of different fund investment methods should be limited, and the investment period should be coordinated according to the characteristics of different social security projects, so that fund investment can give full play to its benefits on the premise of meeting daily expenses.

Legal basis: Article 10 of the Regulations of People's Republic of China (PRC) on National Social Security Fund, if the National Social Security Fund Council entrusts the National Social Security Fund to invest, it shall select professional investment management institutions and professional custodian institutions that meet the statutory conditions to serve as investment managers and custodians of the National Social Security Fund respectively.

The National Social Security Fund Council selects investment managers and custodians in accordance with the principles of openness, fairness and impartiality, publishes selection information, organizes expert review, makes collective discussions and decisions, and announces selection results.

The National Social Security Fund Council shall formulate measures for the selection and appointment of investment managers and custodians, and report them to the financial department of the State Council and the social insurance administrative department of the State Council for the record.