The country's economy expanded 2 percent in the fourth quarter on a quarterly basis, NBS chief Ma Jiantang said at a press conference.

The economy grew 9.1 percent year-on-year in the third quarter of 2011, compared to 9.5 percent in the second quarter and 9.7 percent in the first quarter.

According to preliminary statistics, the country's GDP reached 47.16 trillion yuan ($7.26 trillion) in 2011, Ma said.

He said the country's economic performance in 2011 was "a good start" for the 12th Five-Year Plan (2011-2015) period and is in line with macroeconomic regulations.

For investors, the figures can also be interpreted as good news. Boosted by the data, China's stocks surged 4.18 percent on Tuesday's close, the most since September 3, 2009.

Outlook for 2012

"We should no longer be obsessed with the speed of growth," said Lu Zhongyuan, deputy director of the Development Research Center of the State Council, or China's cabinet. He predicted the expansion of China's GDP will decelerate to around 8.5 percent in 2012.

A report released Tuesday by the Center for Forecasting Science under the Chinese Academy of Sciences also predicted growth of 8.5 percent for this year.

The NBS chief said the country faces a highly complicated external environment in 2012, as the economies of the European Union and the United States remain sluggish, the global financial market is experiencing turbulence and protectionism is on the rise.

There are also a number of domestic risks, including mid- and long-term upward price pressures and funding shortages for small businesses, as well as structural changes intended to enhance energy-saving and emission reduction, he added.

"Although GDP growth fell on a quarterly basis, it was within a reasonable range and the country's economic fundamentals were not changed. We have confidence for 2012's growth," said Ma.

He said the country's urbanization process, the development of its market economy and industrialization have provided exhaustive forces for growth.

The number of people living in China's cities for the first time exceeded those living in the country's rural areas as of the end of 2011, according to the NBS.

NBS data also showed that China's industrial value-added output growth decelerated in 2011 from a year earlier to 13.9 percent year-on-year. The country's fixed-asset investment, a measure of government spending on infrastructure, rose 23.8 percent year-on-year. Retail sales, a key indicator of consumer spending, rose 18.1 percent year-on-year in December 2011, up from the 17.3-percent growth seen in November.

"The figures are very impressive amid complicated international and domestic situations," Ma said.

Ma's comments were echoed by Zhang Xiaojing, a researcher with the Chinese Academy of Social Sciences, a government think tank. Zhang said the slowdown was a result of macroeconomic controls and sluggish external demand.

"Since the country's inflation has eased, the government has more room to fine-tune its macroeconomic policies in the future. Authorities could continue to implement structural tax reduction to change the country's economic structure and improve livelihoods," said Zhang.

A December inflation decrease has fueled widespread guesses about possible policy loosening to spur the slowing economy, although analysts believe that significant easing is unlikely, since inflationary pressures still remain.

The full-year inflation figure for 2011 was still up 5.4 percent from the previous year and well above the government's full-year control target of 4 percent, according to the NBS.

The People's Bank of China lowered banks' reserve requirement ratio (RRR) by 50 basis points in December, its first cut in nearly three years.

The country's central bank will cut the RRR before the Spring Festival holiday and make another two cuts in the first half of the year in an effort to ease the credit crunch among Chinese firms, said Liu Ligang, director of the economic research department of ANZ Greater China.

"The government should consider the long-term, as structural adjustment will be an arduous task. It's vital to boost investment by non-property companies and raise people's incomes. Income distribution reform will not be easy, but it is a must for China's future growth," said Yuan Gangming, a researcher with Tsinghua University.