In 2004, private equity funds began to cooperate with trust companies and launched a trust investment plan, marking the official start of the sunshine operation of private equity funds. In 2006, the CSRC issued the draft of "Pilot Measures for Financial Management in Special Accounts", stipulating that if a fund company handles specific asset management business for a single customer, each business asset shall not be less than 50 million yuan, and the fund company may receive at most 20% of the net income from assets under management. Because special account financing is only open to specific customers and there is a threshold for entry, it cannot be specifically publicized in the media. In fact, it is just like the private equity business of fund companies. In 2007, the "Partnership Enterprise Law" was promulgated, and private equity funds began to set up partnership enterprises, which marked that the internationalization process of private equity funds was obviously accelerated. Therefore, if Sunshine Private Equity wants to grow into a scale and formally start to develop, it should formally enter a comprehensive start-up state in 2004.

Private equity investment (also known as private equity investment or private equity fund) is a very broad concept, which refers to the investment in any kind of equity assets that cannot be traded freely in the stock market. Passive institutional investors may invest in private equity investment funds, which are then managed by private equity investment companies and invest in target companies. Private equity investment can be divided into the following categories: leveraged buyout, venture capital, growth capital, angel investment, mezzanine financing and other forms. Private equity investment funds generally control the management of the companies they invest in and often introduce new management teams to enhance the company's value.