GUIYANG, Dec. 29 (Xinhua) -- Guiyang, capital of southwest China's Guizhou Province, saw its export-import volume rise significantly this year.

The volume has exceeded 4 billion U.S. dollars so far this year, 15 percent higher compared with that of the same period last year, local authorities said.

As an important land-sea transportation hub, Guiyang has increased levels of opening up in recent years to bolster its economy.

The Chengdu-Guiyang high-speed railway went into operation this December, connecting landlocked western areas. A number of international air routes also increased their international reach.

Authorities are implementing a pilot cross-border e-commerce project in Guiyang.