Industrial investment fund is a big concept, which is usually called venture capital and private equity investment fund abroad. Generally speaking, unlisted enterprises with high growth potential invest in equity or quasi-equity, and participate in the operation and management of the invested enterprises, so as to realize capital appreciation through equity transfer after the invested enterprises mature.

Mezzanine fund is a financing source of leveraged buyouts, especially management buyouts. It provides funds between equity and creditor's rights, and its role is to fill the gap of acquisition funds that is still insufficient after considering equity funds and ordinary creditor's rights funds.