Abstract: Based on panel data instrument model, the paper takes as input variables capital, labor, selfinnovation input and technical import input, and compares their contribution to internal trade and export trade. As is discovered, there is a decrease of return scale in hightech internal trade and an increase of return scale in hightech export trade; hightech industry has capital advantages in internal trade and labor advantages in export trade; the contribution of selfinnovation to internal trade is more than that to export trade; technical import has lower efficiency in being negative to internal trade and irrelevant to export trade. At last, the paper also offers some policy advice.

Key words: high-tech industry, self-innovation, technical import, panel data