Abstract: There is a non-linear relationship between research and development (R & D) investment and the catch-up development of strategic emerging industries,which is affected by the efficiency of innovation network.This is because,on the one hand,innovation is a nonlinear and linkage system engineering,and the improvement of innovation efficiency is not only the behavior of individual innovation efforts,but also the result of the joint action of various elements in the innovation ecosystem.On the other hand,the construction of innovation network can enhance the ability of innovative subjects to acquire,absorb and utilize resources,improve the level of optimal allocation of R & D investment resources,and effectively transform R & D investment resources into a power source to promote the development of strategic emerging industries.At present,the efficiency of innovation network in most parts of China is not high,and it has a single threshold effect on the development of strategic emerging industries driven by R & D investment.In the areas with low efficiency of innovation network,increasing R & D investmentcan not effectively promote the development of strategic emerging industries,showing high investment and low efficiency.In the areas with high innovation network efficiency,increasing R & D investment can be efficiently transformed into technological achievements and economic benefits,showing high investment and high efficiency.Therefore,the path of technological innovation in strategic emerging industries should be transformed from input-oriented to efficiency-oriented.The efficiency of innovation network should be improved from the aspects of effective incentive mechanism,upgrading innovation carrier and platform,building collaborative innovation system,cultivating science and technology intermediary service organizations and so on.

Key words: strategic emerging industries, R&, D investment, innovation network, catch-up development, enterprises, efficiency