In the paper, FDI- in- flow in the structure of export trade effect is defined as trade terms and commodity trade structure of the two effects, and through in - depth analysis of empirical data on the reasons for the changes. The empirical results indicate that FDI in the structure of expert trade has shown signs of cyclical fluctuations in effect, the cycle industry in three to five years; direct and indirect effects, the differences in dynamic cyclical changes in the same show, and the effect are both negative effect. On the basis, the paper gives a targeted policy measures to promote the effect of international direct investment to the trade structure.