1. Leverage operation: increase the amount of funds in the portfolio by borrowing, etc., thereby amplifying the income.

2. Futures operation: By purchasing futures contracts, you can get the benefits brought by the index rise.

3. Option operation: buy a call option or a put option to ensure that you can get a certain income when the market falls.

4. Stock selection: Select the blue-chip stocks in the index to improve the income of the whole portfolio.