It refers to a collective investment trust system that collects the unequal funds of most investors who are uncertain in society by issuing fund coupons (such as income coupons, fund shares, fund shares, etc.). ) Trust assets of a certain scale are formed in the form of contracts or companies, which are distributed by specialized investment institutions in accordance with the principle of portfolio, and the proceeds are shared by investors in proportion to their capital contribution, and they bear corresponding risks. Broadly speaking, funds are the collective name of institutional investors, including trust investment funds, unit trust funds, provident funds, insurance funds, retirement funds and funds of various foundations. Funds in the existing securities market, including closed-end funds and open-end funds, have the characteristics of income function and value-added potential. From the accounting point of view, funds refer to funds with specific purposes and uses. Because the investors of government agencies and institutions do not require investment returns and investment recovery, but require funds to be used for designated purposes in accordance with the law or the wishes of the investors, funds are formed.