Abstract:     In order to deal with potential challenges, radical innovation has become an important measure for the sustainable development of enterprises in the new era. Due to the characteristics of high uncertainty and high risk of radical innovation, it needs the joint action of internal and external resources. Boundary-spanning search provides an effective way for enterprises to obtain external heterogeneous resources. However, the existing research has not clarified the relationship between boundary-spanning search and radical innovation. Based on knowledge-based view and resource orchestration theory, this paper discusses the relationship between boundary-spanning search and enterprise radical innovation, and introduces knowledge inertia as mediating variable and knowledge orchestration capability as moderating variable.
    Firstly, based on the literature review, the paper analyzed the relationship between boundary-spanning search and radical innovation, clarified the mediating role of knowledge inertia and the moderating role of knowledge orchestration capability, and put forward six hypotheses. The paper further constructed the conceptual model of the research, which provided a theoretical basis for empirical research.
    Secondly, the paper used the method of questionnaire survey for empirical analysis. The empirical test was carried out through the questionnaire data of 269 enterprises. The paper tested the reliability and validity of the questionnaire, carried out descriptive statistics, and used the method of hierarchical regression analysis to test the six hypotheses. The results showed that: (1) The impact of boundary-spanning search on enterprise radical innovation presented an inverted U-shaped relationship. (2) The influence of boundary-spanning search on knowledge inertia presented a U-shaped relationship. (3) Knowledge inertia had a negative effect on radical innovation. Knowledge inertia played a significant mediating role between boundary-spanning search and radical innovation. (4) Knowledge orchestration capability moderated the relationship between knowledge inertia and radical innovation, and moderated the mediating role of knowledge inertia. In addition, the paper used MEDCURVE and PROCESS program developed by Hayes to further verify the nonlinear mediation and moderated mediation.
    Finally, the paper defined the internal mechanism and boundary conditions of boundary-spanning search affecting radical innovation, deepened the understanding of the relationship between boundary-spanning search and radical innovation, and opened the black box of their internal influence mechanism, which had important theoretical significance and practical enlightenment. 
     The theoretical significance of the paper is reflected in the following aspects: (1) The paper enriches the research on the influencing factors of enterprise radical innovation, and further defines the inverted U-shaped relationship between boundary-spanning search and radical innovation. (2) From the idea of reducing the negative effect of factors in the organization, the research reveals the internal mechanism of boundary-spanning search affecting radical innovation. (3) The research defines the role of knowledge inertia on radical innovation, further finds the negative impact of knowledge inertia on radical innovation, and enriches the literature of knowledge inertia. (4) Based on the resource orchestration theory, this paper introduces the knowledge orchestration capability as the moderating variable, clarifies the boundary conditions of boundary-spanning search affecting radical innovation, and expands the theoretical framework of boundary-spanning search research.
    Enterprises should pay attention to the following aspects in their operations: (1) enterprises should properly  carry out boundary-spanning search activities and reasonably control the scope and degree of boundary-spanning search. (2) Enterprises should establish a continuous learning team, expand relevant knowledge channels and reduce the negative effect of knowledge inertia. (3) Enterprises need to pay attention to the role of knowledge orchestration capability and effectively allocate enterprise knowledge resources, so as to help the emergence of radical innovation.