Theoretically, compared to the rivals who do not have carbon tax or implement loose carbon tax policies, without considering other factors (international politics, trade barriers, etc), levying strict carbon tax on a country might lead to some poor result, say, the declining of the competitiveness due to the rising cost, losing market shares, or moving of the industry to the other countries to avoid this kind of strict carbon tax. In this situation, exports of energy-intensive products of the countries which implement strict carbon tax will probably decline, while the imports may increase. Meanwhile, compared to the competitors, competitiveness has declined, the imports of energy-intensive products, therefore, might increase. This paper analyzes the impact of a carbon tax on the international competitivenes