Trade volume across the Taiwan Straits rose 10.1 percent year-on-year to 55.3 billion U.S. dollars in the January to June period, with the mainland's exports up 15.1 percent to 11 billion dollars and imports up 9 percent to 44.3 billion dollars.

By the end of June, the island had invested an accumulative 44.6 billion dollars on the mainland, taking a 6.2-percent share in the total investment the mainland received from overseas.

With a 40.5-percent share and direct investment totaling 290.3 billion dollars, Hong Kong maintained its position as the biggest investor on the mainland.

In the first half, the mainland's exports to Hong Kong surged 24.3 percent to 83.9 billion dollars, while imports rose 12.8 percent to 5.79 billion dollars.

Meanwhile, the mainland saw the number of its Hong Kong-invested projects increase seven percent to 7,517, worth 10.5 billion dollars, up 19.3 percent.

The mainland's exports to Macao rose 28.1 percent to 1.2 billion dollars, while imports were down by 9.2 percent to 130 million dollars.