Abstract: Open innovation emphasizes that enterprises should integrate and make use of the internal and external resources to absorb innovative elements and achieve performance improvement. The effect of Internet applications on the innovation performance under open innovation is explored. Internet applications are divided into three dimensions， i.e.， Internet flexibility， Internet integration and Internet openness. Then， innovation environment and absorptive capacity serve as the moderating variables to empirically research the influence of Internet applications on innovation performance. The results show that: Internet flexibility， Internet integration and Internet openness have significantly positive impact on innovation performance; innovation environment has positive moderating effect on the influence of Internet applications on innovation performance but has no significant moderating effect between Internet openness and innovation; and absorptive ability has a moderating effect on the relationship between Internet flexibility， Internet integration and innovation performance to a certain extent， but it exerts no moderating effect between Internet openness and innovation performance.

Key words: open innovation, internet application, innovation performance, innovation environment, absorptive capacity