Surplus refers to a country's total export trade is greater than its total import trade in a particular year, which is also called "trade surplus", indicating that the country's foreign trade in that year is in a favorable position.

The size of the surplus largely reflects a country's foreign trade activities in a specific year. At the same time, a large amount of foreign exchange surplus usually leads to an increase in the local currency of a city, which is easy to cause inflationary pressure and is not conducive to the sustained and healthy development of the national economy.

The more trade surplus is not necessarily good, too high trade surplus is a dangerous thing, which means that the growth of domestic economy is more dependent on external demand than at any time in the past few years, and the dependence on foreign countries is too high.