Securities investment fund is a collective investment method, which collects investors' funds and is operated by professional fund managers to obtain investment returns. Engaged in securities investment fund activities need to follow certain principles to ensure that investors' rights and interests are protected and a reasonable return on investment is obtained.

First of all, the principle of transparency is one of the important principles that should be followed in the activities of securities investment funds. Fund managers should fully disclose the investment objectives, investment strategies, investment portfolio and risk control of the fund, so that investors can fully understand the situation of the fund and make rational investment decisions. In addition, the fund manager should promptly and accurately disclose the performance and cost structure of the fund to investors to ensure that investors have a clear understanding of the operation of the fund. Secondly, the principle of risk control is also one of the important principles that securities investment funds should follow. Fund managers should establish and improve the risk management system and formulate reasonable risk control strategies to ensure that the investment risks of funds are effectively controlled. For example, fund managers should make full risk assessment, rationally allocate investment portfolio and control investment risks according to the characteristics of funds and market conditions. In addition, fund managers should also establish a sound risk management system, strengthen the monitoring of the fund portfolio, and find and deal with risks in time.

Thirdly, the principle of compliance is also one of the important principles that should be followed in securities investment fund activities. Fund managers shall abide by relevant laws and regulations, industry norms and fund contracts to ensure that the fund operation is legal and compliant. For example, fund managers should abide by the provisions of the Securities Law, the Fund Law and other laws and regulations to ensure that the investment behavior of funds meets the requirements of laws and regulations. In addition, the fund manager should also abide by the provisions of the fund contract to ensure that the fund operation conforms to the provisions of the fund contract. Finally, the principle of giving priority to investors' interests is also one of the important principles that securities investment funds should follow. Fund managers should put the interests of investors in the first place and conduct investment operations in accordance with the principle of maximizing the interests of investors. For example, fund managers should formulate reasonable investment strategies, get investment returns as much as possible, control investment risks reasonably and protect investors' rights and interests. In addition, the fund manager should strictly implement the provisions of the fund contract to ensure that the interests of investors are fully protected.

To sum up, engaging in securities investment fund activities should follow the principles of transparency, controllable risks, compliance and giving priority to investors' interests, so as to ensure that investors' rights and interests are protected and a reasonable return on investment is obtained.