If you are optimistic about the market outlook, you can buy index funds at a low level of 2000 points, such as dividend index ETF, SSE 50ETF and CSI 300. If you are bearish on the market outlook, you can sell the above-mentioned funds at a high level of 2800 points, and then make up the position from the low position to carry out the band operation of low suction and high suction.