China's economy gained momentum in December as the monthly GDP skyrocketed by 10.7 percent, bringing the country's 2009 economy growth to 8.7 percent, the National Bureau of Statistics reported on Thursday in Beijing.

The bureau put the yearly GDP as 33.5353 trillion yuan (US$ 4.89 trillion).

Meanwhile, the bureau said the consumer price index, a major gauge of inflation, decreased 0.7 percent in 2009 as compared with 2008.

But it rose by 1.9 percent in December, prompting the central government to take measure to curb lending and rein in a loose monetary policy.