With the continuous development and enlargement of sports industry of China, the proportion of sports industry in the national economy is bigger and bigger, sports industry has become a green industry in the development of national economy, has been widely approved to contain the economic value and is a new force to expand domestic demand. The study of the scholars on sports industry is mostly qualitative analysis, and almost there is not quantitative analysis. This paper gives empirical analysis through the establishment of regression model, and the result shows that there is significant Granger causality relation between sports industry and national economy. At last policy suggestions for developing sports industry are given according to the empirical results.