Investors buy funds before T 15: 00, and confirm their shares according to the net value announced that night. The net value of the fund announced that night is the cost of holding positions. Therefore, when the fund falls, adding positions before 3 o'clock will lower the cost of holding positions.

Investors should reasonably control their positions when adding positions, and the following methods can be adopted:

1, equal purchase method:

Investors can choose to buy the same amount every time when the fund falls sharply, such as 1000 yuan every time.

2. Equal difference purchase method:

During the decline of the fund's net value, investors buy the same amount every time. For example, investors buy three times, and the amount of each purchase is 1000 yuan, 2,000 yuan and 3,000 yuan respectively.

3. Equal proportion purchase method:

During the decline of the fund's net value, investors buy the same amount every time. For example, the amount that investors buy each time is 1000 yuan, 2,000 yuan and 4,000 yuan respectively.