The basic principle of social security fund investment operation is to realize the appreciation of fund assets on the premise of ensuring the security and liquidity of fund assets. Social security fund assets are assets independent of the board of directors, social security fund investment managers and social security fund custodians. This is the so-called "social security fund" that can enter the stock market.

According to the Interim Measures for Investment Management of National Social Security Fund approved by the State Council, the investment scope of social security fund is limited to bank deposits, buying and selling government bonds and other financial instruments with good liquidity, including listed securities investment funds, stocks, corporate bonds and financial bonds with credit rating above investment grade.