With comprehensively utilizating correlation and regression analysis method, the quantitative and the qualitative analysis, This article have discussed FDI's influence on the aspect of economy growth and the industrial optimization in Yangtze triangle economical circle. In the economical growth stratification plane, through using the Cob-Douglas function and establishing Multiple linear Regression equation, we had proven FDI was the power which promoted the region economy grows, but this power is obviously to be smaller than that of the domestic capital investment and the labor force investment. In the industrial optimization stratification plane, through using correlation coefficient analysis method, we had proven the FDI's the impetus function on promoting the region industry optimization.