The fund will not lose all its principal. The worst case is that the net value of the fund will fall to a certain extent and it will be liquidated. For example, a fund whose closing line is 0.3 yuan will be closed when its net value falls below 0.3 yuan. After the liquidation, the fund will return the remaining funds to investors in proportion to their positions. Set the stop-loss and profit-taking position: after investors buy funds, set the stop-loss position to control the risk within a certain range. Investors can set stop-loss points and take-profit points according to the important price in the previous period, or according to their own risk tolerance. For example, some relatively stable investors will set the stop loss point 1% to 2% and the take profit point 10%. Some more radical investors will set the loss of 5% to 10% as the stop loss point, and increase 10% to 20% until the profit point.