Mr Geithner said tight control of currency pricing by some countries was hurting global economy.

The United States and other developed nations have been critical of China's exchange rate policy.

The meeting is being attended by some of the financial world's biggest names.

Mr Geithner said that the Group of 20 nations was working closely to put in place a system that would streamline the exchange rates globally.

"We have been engaged in a multilateral effort in the G20 to establish stronger norms for exchange rate policy," he said.

China has been pushing for the yuan to become a global reserve currency.

That push got a big boost as the French President, Nicolas Sarkozy, suggested that given the importance of emerging economies such as China to global growth, their currencies should be added to the International Monetary Fund's Special Drawing Right (SDR) basket.

His comments were backed by Mr Geithner who said he supported a change to the SDR composition.

"Over time, we believe that currencies of large economies heavily used in international trade and financial transactions should become a part of the SDR basket," he said.

However, Mr Geithner said that for that to happen, the countries would have to loosen their control on the currency.

"To achieve this objective, the concerned countries should have flexible exchange rate systems, independent central banks and permit the free movement of capital flows," he said.