In the Qing Dynasty, the coastal trade in the Northeast started in the middle of Kangxi years, and got great development in The Qianlong -Jiaqing years.

There are nineteen trading-ports in the border area of Yunnan Province,of which ten are the first-class trading-ports,nine are the second-class trading-ports plus eighty-nine border passageways where the transient population from abroad prefers to stay.

Taiwan investment in the Chinese mainland and trade across the Taiwan Straits constitute the core of development of economy and trade across the Straits.

Generally,the current situation of trade across the Taiwan Straits is characterized by the continuous expansions of trading scales,the transformation from indirect to direct trade,the increasing dependency on trade,the development of the trade structure towards plurality and complementation.