Mainly by issuing beneficiary certificates (fund shares) to investors, professional fund management institutions concentrate social funds to invest in various assets. According to accounting net's inquiry, investment fund is a collective investment mode, which embodies portfolio investment, professional management, benefit sharing and risk sharing. It concentrates social funds mainly by issuing beneficiary certificates (fund shares) to investors, and hands them over to professional fund management institutions to invest in various assets, including securities investment funds, private equity funds, venture capital funds, hedge funds and alternative investment funds.