Based on the input and output table of national economic accounting in 2007 and 2012, by calculating the index of industrial relevance and the index of input-output relationship, this paper analyzes the changing trend of China's industrial structure and specific industrial sectors' influence on the national economy. It also pays attention to the changes in the distribution of the industrial structure of traditional processing manufacturing and high value-added capital technology-intensive industries in China, and attempts to reflect the role of capital technology factors on China's industrial structure adjustment. The conclusion shows that the industries that have a significant role in promoting and stimulating the national economy are still mostly high value-added, capital and technology-intensive processing manufacturing industries, but the positive impact of productive services on the national economy is also significant. In addition, from the perspective of factor supply, it is found that the supply structure of China's capital factor is not reasonable, while the forward linkage between the production and supply sectors of technological factors and other industrial sectors is weakening, also the driving effect on the national economy is declining.