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The statement, by China’s central bank, was the clearest sign yet that the country would allow its currency to appreciate gradually against the dollar. World leaders are due to meet next week in Canada for economic talks, and China’s currency policies appeared bound to be a source of conflict.

The United States has been leading a chorus of countries urging China to let its currency fluctuate. Many members of Congress believe China’s exchange rate policy gives it an unfair trade advantage, and a movement has been growing to take retaliatory trade action if China did not make an adjustment.

President Obama and the Treasury secretary, Timothy F. Geithner, immediately praised China’s action. “China’s decision to increase the flexibility of its exchange rate is a constructive step that can help safeguard the recovery and contribute to a more balanced global economy,” Mr. Obama said in a statement. The European Commission also said it supported the move.

But it remains to be seen whether the move will significantly rebalance the global trade picture. The People’s Bank of China was cautious in its statement about how far its currency, the renminbi, might fluctuate, warning explicitly that “the basis for large-scale appreciation of the RMB exchange rate does not exist.” Chinese officials said the renminbi would move in relation to an unspecified basket of currencies, not just the dollar. Experts said that depending on how the system was designed, China could avoid rapid fluctuations.

Mr. Geithner alluded to this in a statement, saying, “This is an important step, but the test will be how far and how fast they let the currency appreciate.”