China will find it difficult to maintain high investment growth in the future, the State Information Center, a government think tank, said on Monday.

Investment growth is expected to be stable, with a predicted fixed-asset investment increase of 21 percent, the center said.

Investment growth in real estate may reach 18.2 percent.

"Policy will not focus on strengthening stimulus or accelerating investment, but emphasizing adjusting the investment structure, as well as improving its efficiency and quality," the center said.