3 An empirical research about corporategovernance on enterprise innovation3.1 Research assumptions(1)There is a negative correlation between ownershipconcentration degree and enterprise innovation level.The degree of ownership concentration will change withthe change of proportion of shares held by differentshareholders. When the proportion of shares held by thelargest shareholder increases, the degree of ownershipcentralization will increase, the control rights of thelargest shareholder will increase, and the managementrisk will increase subsequently. In order to avoid therisk of innovation activities, R & D investment will be reduced [17] .