BEIJING (Reuters) - China chalked up  unexpectedly strong annual growth of 11.9 percent in the first quarter,  prompting renewed calls for tighter policies to prevent the economy from  overheating and stoking speculation of when Beijing will loosen its  grip on the yuan.
   The rate of expansion, the fastest since  2007 and above the median forecast of 11.5 percent in a Reuters poll,  was flattered by a low base of comparison a year earlier, when the  economy was reeling from the global financial crisis.
But economists said the figures, released on  Thursday by the National Bureau of Statistics, were unquestionably  sturdy and would justify a firmer policy stance.
Some, but by no means all, economists  advocated a pre-emptive rise in interest rates to curb inflationary  pressures, while Glenn Maguire with Societe Generale in Hong Kong said  he favored a prompt revaluation of China's currency.
"Yuan stability and China's stimulus package  made an enormous contribution to global stability in the aftermath of  the crisis, but now that China's economy is growing by 12 percent, it's  time for China to share some of that growth with the rest of the world  via appreciating its exchange rate," he said.
The  Commerce Ministry promptly reaffirmed its opposition to a stronger  yuan. A spokesman said Washington was wrong to argue that, by holding  down the currency, Beijing was giving Chinese exporters an unfair  competitive edge and thereby contributing to near double-digit U.S.  unemployment.
The yuan, also known  as the renminbi, rose modestly in the offshore forwards market, which  was pricing in a 3.3 percent rise against the dollar over the next year.
That was only a bit stronger than the day  before, even though Singapore had fanned market talk of yuan  appreciation by pushing up the value of the Singapore dollar on  Wednesday in response to blistering growth data.
LONGER-RUN CONSIDERATIONS
Mark Williams with Capital Economics in  London said the mildness of price pressures in China meant there was no  pressing economic reason for Beijing to let the yuan rise after keeping  it pegged near 6.83 per dollar for the past 21 months.
The consumer price index rose just 2.4  percent in the year to March, below market expectations of a 2.6 percent  increase.
"However, economic  rebalancing would in the long run be better served by having a stronger  currency," Williams said.
He  expects a shift in both interest rates and the yuan over the next  quarter -- but with an eye on the medium-term benefits of a stronger  currency and higher interest rates.
"As  a result, the pace of movement will be slow," he said in a note.
So far this year the central bank has  twice raised the proportion of deposits that banks must hold in reserve  and has also aggressively drained cash from the banking system.
But unlike a clutch of Asian neighbors,  including India and Malaysia, China has kept its benchmark interest  rates unchanged even though it is leading the global recovery charge.
"The government is faced with an  unpalatable choice: raise rates and dampen the ardor of investors in the  real estate sector, or leave rates on hold and allow the property  bubble to expand further, and risk inflationary expectations taking  hold," said Tom Orlik with Stone & McCarthy Research in Beijing.
Instead of acting through interest rates or  the exchange rate, the central bank has relied so far on curbing credit  growth to keep the economy on an even keel.
This  year's quota for new bank lending has been cut to 7.5 trillion yuan  from a record 9.6 trillion yuan in 2009 when banks lent freely at the  government's behest to support a 4 trillion yuan fiscal stimulus package  -- spending that Beijing is now gradually winding back.
The government has been taking particular  aim at the bubbly property market, where prices nationwide leapt 11.7  percent in the year to March and much faster in major cities.
In a fresh salvo against speculators, the  cabinet on Thursday raised mortgage rates and down payment requirements  for investment properties. Buyers may now borrow only 50 percent of the  cost of a second home, down from 60 percent previously.
"This will have an immediate impact on  speculative house buyers," said Huang Qinglin, a property analyst with  Great Wall Securities in Shenzhen.
TOO  LITTLE, TOO LATE
The worry for  some economists is that Beijing is nevertheless falling behind the  curve.
The State Council, China's  cabinet, promised on Wednesday after a preview of the data to stick to  the "appropriately loose" monetary stance and active fiscal policy first  adopted at the height of the global financial crisis in late 2008.
"Growth is running too hot. It requires  policy tightening," said Ben Simpfendorfer, an economist with Royal Bank  of Scotland in Hong Kong. He called Thursday's data "a dangerous mix"  because the low inflation reading would delay a rise in borrowing costs.
J.P. Morgan, CLSA, Citi and Barclays  Capital were among banks that promptly raised their growth forecasts for  2010, a year in which China will almost certainly overtake Japan to  become the biggest economy in the world after the United States.
In addition to quarterly GDP, China  released a batch of figures for March that were strong and close to  expectations.
Retail sales rose  18.0 percent from a year earlier, factory output grew 18.1 percent, and  urban investment in fixed assets like roads and factories rose 26.4  percent in the first quarter.
"This  year, the economy's momentum has increased. We are off to a good  start," statistics office spokesman Li Xiaochao said.
The figures cap a good week for the Asian  economy. Apart from the growth surge that prompted Singapore to let its  currency appreciate, South Korea won an upgrade of its sovereign debt  rating on Wednesday from Moody's Investors Service.
Encouraged by the bullish news, non-Japan  Asia stocks rose on Thursday to their highest level in almost two years.
However, regardless of the degree of policy  tightening to come, the first quarter could well prove to be the high  watermark for growth this year.
For  a start, Li from the statistics office noted, the base of comparison  will become increasingly demanding.
"The  global economy is recovering slowly and it is not yet balanced.  Commodity prices are high and there are sovereign debt worries in some  countries. So there are many uncertainties," he added.
(Additional reporting by Aileen Wang,  Michael Wei, Langi Chiang and Melanie  Lee; Writing by Alan  Wheatley; Editing by Kim Coghill and Neil Fullick)