Innovation is the result of a combination of different inputs,and a great part of literatures on the matter has found that the external sources of innovative inputs have been playing more and more roles in the innovation at firm level.

Study on supply chain coordination of upstream innovation investment when retailers compete;

Supply chain coordination of competitive retailers' innovation investment

Focusing on the subject of influencing factors on the open innovation of enterprises, this paper tries to grope for ways to improve the performance of open innovation based on external source of innovation in China by controlling those factors.

It will be more reasonable that we substitute total innovation investments for R&D investments to measure the level of technology innovation.