The net asset value of the fund is the balance of the total market value of the fund assets after deducting liabilities at a certain time, which represents the rights and interests of the fund holders. Net asset value of unit fund, that is, the net asset value of the fund represented by each fund unit. Net asset value of fund units = (total assets-total liabilities)/total number of fund units. Among them, total assets refer to all assets owned by the fund, including stocks, bonds, bank deposits and other securities. Total liabilities refer to liabilities arising from fund operation and financing, including expenses payable to others, interest payable on funds, etc. The total number of fund shares refers to the total number of fund shares issued at that time. Cumulative unit net value = unit net value after the establishment of the fund+cumulative unit dividend amount. The level of fund net value is not the main basis for choosing a fund, but the future growth of fund net value is the key to judge the investment value. The level of net worth is influenced by many other factors besides the management ability of fund managers. If the fund has been established for a long time, or has grown rapidly since its establishment, the net value of the fund will naturally be higher. If the fund has been established for a short time, or the entry time is not good, the net value of the fund may be relatively low. Therefore, if only the current net value of the fund is used as the standard of whether to buy the fund, the wrong decision will often be made. Buying a fund depends on the future growth of the net value of the fund, which is the correct investment policy.