In this paper, we examine the impact on the amount and structure of China’s steel export after cancellingtax rebate policy using a new method,“difference on difference”, and 6-bit export data (Chap.72 under HSclassification). The empirical study shows that the cancelling of tax rebate policy in July 2010 significantlysuppressed the export of concerned products. Among the four categories of products, the export growth appearssignificantly different. The export growth of control group (eliminated tax rebates products) appears 54% to 98%lower than the compared group when we study China’s world trade, while 30% to 69% lower when we take SinoROKtrade as an example. Considering the stable influence on the demand of a certain country, such as trade policy,exchange rate and other factors, we think the empirical results of Sino-ROK can reflect the actual effects of tax rebate policy more objectively.