Innovation is the core motivation of the economic development, while the open innovation model provides our country enterprise an opportunity to improve the innovation capability. The implementation of the open innovation improve the enterprise innovation capacity, for it makes the enterprise can effectively integrate internal and external innovation resources, constructs a new innovation system and reduces the uncertainty in the process of innovation. However, excessive open will increase the transaction cost of enterprises, excessively depend on external resources and improve the probability of core technology leakage. All these are not conducive to the promotion of enterprise innovation capacity. This thesis makes an empirical analysis by using the Pearson correlation coefficient. The result shows that the open innovation and enterprise innovation capability is "inverted U" relationship.