Import and export trade is produced and developed under certain historical conditions. In the trade between countries, the import is the purchase, the export is the export, and the import and export are combined. A series of specific businesses, including labor, technology, etc., are carried out by concluding contracts with foreign parties to buy and sell commodities. The specific contents include: trading and trading methods of import and export commodities; transportation and storage of import and export commodities; inspection of import and export commodities; customs supervision of import and export commodities; freight insurance of import and export commodities; settlement of payment for import and export commodities International settlement and bank credit business that provides funds, arbitration and judicial trials for resolving disputes over import and export business; operation and management of import and export business, etc.