Abstract: The technological innovation is not only the power ful headspring that increases competitive advantage of enterprises,but also important guarantee that improves the viability and development of enter prises.However,the technological innovation is a kind of high risk activity.In order to avoid and reduce the loss,enter prises must manage and control the technological innovation risk.And accurate measure ment is the basis for enterprises to manage and control the technological innovation risk.In this paper,on the basis of matter-element and extension set theories,the mult idimensional extension matter-element model of comprehensive risk measure of enterprise technological innovation is established,and the extension measure method of technological innovation risk is proposed.This method can take into comprehen sive considerationall kinds of subjective information and objective information of enterprise technological innovation,and reflect the risk factors states in the process of enterprise technology innovation.It can not only measure the comprehensive risk of enterprise technological innovation,but also evaluate the objective risk and subjective risk of enterprise technology innovation.T heoretical analysis and experimental results show the feasibility and validity of the model.The research work supplies a new way for technological innovation risk measure.

Key words: technological innovation risk, risk measure, matter element model, extension set, subjective risk