A fund is a fund manager who collects all investors' money, invests it in different targets, and distributes the money to investors according to the share of investment income.

Fund performance is affected by investment targets. If the investment target goes up as a whole, the fund will go up, and if it goes down as a whole, the fund will go down.

The Shanghai Composite Index has gone up, but your fund has gone down. The reason is that the investment target of the fund you bought has little to do with the Shanghai Composite Index.