The simplest definition of capital preservation fund is that after a certain period of time (usually 3 to 5 years, up to 10 years at the longest), investors will get a certain proportion of the investment principal (for example, 100% of the principal), and at the same time, if the fund is successful, investors will get additional income. Because the capital preservation fund has a certain closed period, that is, if investors redeem their shares during the closed period, they will not get the capital preservation promise of the fund company, so the capital preservation fund is also called "semi-closed fund".