1. Choose index funds with large fluctuations for fixed investment. The average income is obtained from the fixed investment of the fund. The greater the fluctuation of the fund, the more it can give play to its advantages.

2. When it falls, it will be fixed, and when it rises, it will be suspended. When the fixed investment falls, it will reduce the cost, and when it rises, it will increase the cost, so it is best to suspend the fixed investment when it rises.

3, long-term fixed investment, long-term fixed investment is meaningful, historically, the probability of long-term fixed investment is relatively large.

4. Choose a fixed investment on Thursday. Historically, the probability of falling on Thursday is greater than rising, and a fixed investment on Thursday will make investors' costs lower.