Abstract: International externality of environment standard means transfer of pollution across borders and new obstacles blocking the entrance into international market in international trade and investment.They are caused by the different environment standards in different countries.International externalities of environment standard have broad negative effects,such as causing friction and conflict in international trade,increasing the pollution,and obstructing the economical development in developing countries.To internalize international externalities of environment standard,we should strengthen the international harmonization of environment standard,and establish international compensation and assistant mechanism,and should improve ISO14000,the environment management system standard.

Key words: environment standard, international externality, internality, international harmonization