With three months of 2006 left, China's trade surplus for the year has already hit $110bn (£59bn), breaking the record set in 2005, official data has shown.
China's currency is undervalued, say many of its trading partners
The gap between what China exports to and imports from the rest of the world narrowed to $15.3bn in September from August's monthly record of $18.8bn.
Some of China's trading partners, especially the US, have argued China keeps the yuan low to boost exports.
Last week, the European Union imposed new tariffs on shoe imports from China.
"The smaller trade surplus might be a relief for the authorities," said Xiao Minjie, an economist at Daiwa Institute of Research in Shanghai.
"I think the trade surplus is likely to narrow to around $10bn next month.
"But the upward pressure on the yuan will persist."
China wants to redirect some of its strong export growth towards greater domestic consumption in order to make its economy more balanced.
The September figures showed exports were up 31% and imports 22% higher from the same month in 2005.
The trade imbalance has seen the country's foreign reserves rocket to $1 trillion.
This has helped to create an investment boom which the government is trying to dampen down in order to prevent the economy growing too fast.
China's economy is currently expected to grow by more than 10% this year.