Private investment is playing an increa-singly larger role in China's overall investment landscape, but the economy is yet to become open enough to unlock the full potential of private investors.

The National Development and Reform Commission said on Monday that the ratio of private capital in total social fixed-asset investment rose from 55.9 percent in 2010 to 61.4 percent in 2012, and had risen still further to 63.7 percent in the first half of this year.

China has been making solid headway in opening-up its economy to non-State investors. In some areas, such as non-metallic mining and equipment making, about 90 percent of the total investment was private in the first half of this year.