China's exports declined more than expected in September reflecting weak global growth and trade disputes with the US administration.

In dollar terms, exports fell 3.2% year-on-year in September, data from the General Administration of Customs showed. This was bigger than the expected 3 percent decrease and prior month's 1% fall.

At the same time, imports decreased 8.5% annually versus the expected decline of 6%.

As a result, the trade surplus increased to $39.65 billion from $34.83 billion a month ago. The expected level was $33.33 billion.

In yuan terms, exports and imports dropped 0.7% and 6.2%, respectively in September.

Data came after the US and China reached a "phase one" trade deal last week. The US agreed to hold off on tariff hikes planned for this week.