Since the reform and opening-up, China’s export scored considerable development and got great achievements. This paper analyzes the dynamic changes of export specialization industries in China during the period of 1985-2011. The following conclusions are established. First, the analysis results explain that export dominates in China’s trade, representing a trade surplus in trade oriented economy. The export value rose from 15.03 (US billion dollar) in 1985 to 1898.39 (US billion dollar) in 2011, representing an annual average growth rate of 20.45 percent. On the other hand, the value of import rose from 16.83 (US billion dollar) in 1985 to 1743.39 (US billion dollar) in 2011, representing an annual average growth rate of 19.54 percent. Second, China’s export share in the world’s total export grew from 0.95 percent in 1985 to 13.71 percent in 2011, which share of China’ CA export items grew from 0.90 percent in 1985 to 11.31 percent in 2011, share of China’s CD export items grew from 0.05 percent to 2.39 percent in 2011, respectively. China's overall comparative advantage has become higher as export competitiveness has increased in comparative disadvantage industries. Third, during the selected period, China’s CA has shifted from primary products to manufactured products. The analysis results show that the structural changes in China’s pattern of comparative advantages were dynamic in 1985-2011, and China reveals a despecialization pattern in export. Fourth, China’s top-ten exporting commodities have been dominated by manufactured sectors since 1995. The analysis results reveal that China’s export specialization industries have moved from primary items to manufactured items, from low technology industries to high technology industries. In terms of kinds of exported commodities, machinery and transport equipment (SITC 7) and miscellaneous manufactured articles (SITC 8) contribute more than other industries on the total export of China. Finally, intra-industry trade has increased over time, as export variety and output of high technology industries have increased. The analytical results show that the average IIT index of all the commodities increases from 8.44 percent in 1985 to 40.63 percent in 2011, and the manufactured goods play an increasingly important role than primary goods in observed IIT levels in China. In the perspective of categories based on technology, it is shown that the high technology industries dominate the rapid growth of China’s IIT levels.