Not all funds are suitable for fixed investment. For example, the fluctuation of money funds and bond funds is very small, so you can buy them directly at one time without long-term fixed investment. Generally speaking, funds suitable for fixed investment have the following characteristics: large fluctuations. Generally speaking, volatile funds are suitable for fixed investment, such as index funds and equity funds. The greater the fund fluctuation, the more smooth the cost through fixed investment; When the market goes up, the fund with large fluctuation gets relatively high returns. The valuation is low. It is not enough to choose a fund with large fluctuations. When the fund decides to choose the target fund, it must pay attention to the texture of the fund. At present, the mainstream selection method is PE valuation based on the index tracked by fixed investment funds. The lower the valuation, the more suitable for fixed investment.