China's trade surplus rose for the second month in August, up 14.9 percent to $28.69 billion from a year earlier.

Exports last month gained 21.1 percent to $134.87 billion, while imports climbed 23.1 percent to $106.18 billion, the General Administration of Customs said on Wednesday.

The trade gap narrowed 6.2 percent annually to $151.99 billion in the first eight months of the year.

Exports increased 22.4 percent to $937.69 billion during the January-August period and imports were up 30 percent to $785.69 billion.