Investment will remain a major driver of China's economy as a result of the government's mini-stimulus, and experts forecast that capital-driven growth will continue to accelerate for the rest of the year as the economic outlook brightens.

As of the end of September, fixed-asset investment was up 20.2 percent year-on-year to 30.9 trillion yuan ($5.07 trillion), the National Bureau of Statistics said on Friday.

Investment-driven growth contributed 55.8 percent, or 4.3 percentage points, of the overall GDP expansion in the first three quarters, according to Sheng Laiyun, NBS spokesman.