the available share is the redeemed money. The available share of fund redemption is the share held by ordinary investors, which is the available share, that is, the total fund share at the time of redemption when it can be sold. Fund, in a broad sense, refers to a certain amount of funds set up for a certain purpose. It mainly includes trust and investment funds, provident funds, insurance funds, retirement funds and funds of various foundations. From the perspective of accounting, fund is a narrow concept, which means funds with specific purposes and uses. Usually mentioned funds mainly refer to securities investment funds. Fund share redemption is a redemption method in which investors apply according to the share sold, rather than the amount sold. Because investors are investing in open-end funds, when applying for purchasing funds, they should apply according to the amount of funds purchased or the share of funds purchased. The income of securities investment funds comes from the future, and the performance of income is inseparable from the performance of the underlying market of investment targets, which has certain risks.