After the establishment of a private equity fund, investors can participate in the fund through subscription. Through the subscription process, investors need to fill in the questionnaire survey of private equity funds, evaluate their risk identification ability and risk-taking ability, and make a written commitment that meets the requirements of qualified investment. This helps to ensure that investors have enough risk awareness and ability to participate in private equity investment. Investors need to sign a risk disclosure statement, which includes special risks, general risks and investors' rights and interests of private placement products. Investors need to read and sign the terms of the contract one by one to ensure that the relevant risks are fully understood and accepted. Investors need to provide proof of assets or income to prove that they have sufficient financial strength to bear the investment risks of private equity funds. These documents can help fund managers evaluate the qualifications and appropriateness of investors to ensure that investors can meet the requirements of the fund.