The net value of the fund at the time of purchase is three points on the trading day. Buying before three o'clock on the trading day is calculated according to the net value of the day, and buying after three o'clock is calculated according to the net value of the next trading day. In other words, if you buy on weekends or holidays, it is calculated according to the net value of holidays or Monday. After buying the net value of different periods, the system will make a weighted average according to the share and net value. For example, an investor buys a fund of 1 1,000 yuan with the net value of 2 yuan today, and buys a fund of 1 1,000 yuan with the price of 1.8 yuan the next day. After weighting, the investor's cost price is 1.9 yuan (excluding subscription fee).

As can be seen from the above example, if the cost of buying a warehouse is low, investors will reduce their own costs. If the price of buying the bottom warehouse is higher than the price of the bottom warehouse, it will increase the cost of holding positions. Therefore, when covering or adding positions, it is best to do it when it falls sharply, otherwise it may be sold at a high level.