Abstract: Technical Barriers to Trade(TBT) is the main body of contemporary international trade barriers.Causes for the formation of TBT can be divided into three big classes,such as economic and technical factors,social and political factors,GATT/WTO rule factors.Economic and technical factors mainly include different competitive advantages of products from all countries,different levels of consumption demand in different countries,the unbalanced development of world economy,and the advanced development of science and technology.Social and political factors mainly include the wide spread of the conception of sustainable development,the increasingly outstanding state of consumption security,and the use of trade policy as the tool for domestic and foreign political struggles.GATT/WTO rule factors mainly include the increasingly weakening utility of tariff barriers and traditional non-tariff barriers,and the misuse of TBT rules by trade protectionism.

Key words: Technical Barriers to Trade(TBT), cause of formation, economic and technical factor, social and political factor, GATT/WTO rules