China's trade surplus with the US ballooned to a record $34.1 billion in September despite a raft of US tariffs, official data showed today, adding fuel to the spiralling trade war. 

China's exports to the US rose to $46.7 billion while imports slumped to $12.6 billion, according to the customs administration. 

The world's top two economies imposed new tariffs on a massive amount of each other's goods mid-September, with the US targeting $200 billion in Chinese imports and Beijing firing back at $60 billion worth of US goods. 

"China-US trade friction has caused trouble and pounded our foreign trade development," customs spokesman Li Kuiwen said, adding that the overall situation could be controlled. 

China's overall trade surplus expanded to $31.6 billion, as exports rose faster than imports. 

Exports jumped 14.5% for September, beating forecasts from analysts polled by Bloomberg News, while imports rose 14.3% on-year. 

While the data showed China's trade remained strong for the month, analysts forecast the trade war will start to hurt in coming months.