证券投资基金是指一种利益共享、风险共担的集合证券投资方式，即通过发行基金单位，集中投资者的资金，由基金托管人托管，由基金管理人管理和运用资金，从事股票、债券等金融工具的投资。我国目前上市的几只证券投资基金，均为封闭式契约型基金。说它封闭，是因为它们的发行 Securities investment fund refers to a kind of shared securities investment with risk-sharing and sharing of risks. That is, through the issuance of fund units, the investors of the fund are concentrated, managed by fund trustees, managed and utilized by fund managers, and engaged in stocks and bonds And other financial instruments investment. China’s current listing of a few securities investment funds are closed-end contract funds. It is closed because of their distribution