By using of market share，price index trade competitive index and revealed comparative advantage index，this paper triestoexp lore the competitiveness of China'sseamless steel pipein American market during 2000-2008. The empirical results show that though China's seamless steel pipe occupieda greater market share and price advantage in American market，the other two indices indicate that the competitivenessof China's seamless steel pipeis inferior to Austia and Spain.This study finally provides some advices on how to improve the competitiveness of China's seamless steel pipe in American market.