State-owned capital refers to state-owned capital, including state-owned enterprises and state-owned banks. In modern national economy, state-owned capital plays an important role in economic development. The state usually promotes economic development through state-owned capital investment and control, and guides private capital to participate in investment activities in various fields.

In China, it is ok for state-owned capital to participate in projects to encourage private capital investment. According to the State-owned Assets Law of People's Republic of China (PRC), state-owned capital can participate in economic activities in various ways, including cooperation, joint venture, joint venture and cooperation with other ownership capitals, as well as the establishment of holding companies, holding shares and investment funds through capital contribution.

Specifically, state-owned capital can invest in designated projects together with private capital to encourage private capital investment. This kind of cooperation can be carried out in the form of joint venture, cooperation, joint venture, trusteeship and lease. State-owned capital can provide support in terms of capital, technology and management experience, and promote the development of projects that encourage private capital investment.

This kind of cooperation can promote economic development, give full play to the complementary advantages of state-owned capital and private capital, promote the effective allocation of resources, promote the optimization and upgrading of industrial structure, and achieve high-quality economic development. From the practical experience, many successful cases have been achieved when state-owned capital participates in encouraging private capital investment projects.

In short, state-owned capital can participate in encouraging private capital to invest in projects and promote project development through joint ventures and cooperation, thus promoting economic prosperity and social progress.