China's top economic planner on Monday issued 21 measures to support the private investment, saying that it would further support the participation of private investment in key infrastructure projects, science and innovation.

China will increase policy support to invigorate private investment, help mobilize the enthusiasm for investment, stabilize market expectations, create more jobs and promote high-quality economic development as private investment accounts for more than half of total investment, the National Development and Reform Commission (NDRC) said on Monday.

The NDRC said that it will further improve the social environment for private investment, set up "red lights" and "green lights" on the premise of preventing disorderly capital expansion, and introduce a number of "green light" investment cases to regulate and guide the sound development of private capital.

The NDRC said relevant departments should respond to market concerns in a timely manner, stabilize market expectations, assess the consistency between proposed policies and macro policies, and not let policies and measures dampen the enthusiasm of private investment.

The NDRC also said that it will support private investment in 102 major projects involved in the 14th Five-Year Plan (2021-25) and projects that serve the national strategies, such as transportation, water conservation and energy projects for carbon reduction and vowed equal treatment to private investment in the bidding process.

Private enterprises are also encouraged to participate in science and innovation projects, NDRC said. Platform economies are encouraged to participate in artificial intelligence, cloud computing and blockchain sectors. Meanwhile central-owned enterprises are encouraged to step up the use of new products and technologies from private enterprises and guide private enterprises to participate in the supply chain of major projects.

Asked if China has now completed rectification of the platform enterprises, Cyberspace Administration of China on Monday said it will give equal attention to promote development of industry and carry out regulatory norms, place equal emphasis on social and economic benefits, so as to create a favorable environment for the development of platform companies.

The number of private enterprises in the country has quadrupled in the past decade, increasing from 10.85 million to 44.57 million. Since 2012, private investment has accounted for over 55 percent of total investment nationwide, as the main force driving investment growth, the NDRC said in a press conference in June.