In the process of portfolio management, the in-depth study and analysis of the securities invested is conducive to the effective use and dissemination of information, the reasonable pricing of the market, the improvement of market effectiveness and the rational allocation of resources. Securities investment funds give full play to the advantages of professional financial management and promote the formation of market value judgment system. Advocating a rational investment culture helps to prevent excessive speculation in the market. Securities investment funds with different types, different investment objects and different risk-return characteristics not only provide investors with a wide range of choices, but also become one of the sources of constant changes in the capital market and continuous innovation of financial products.