Abstract:Taking the rooted theory method as the leading tool, the process of disruptive innovation of BYD is deeply analyzed, and the coupling model of technological innovation and business model innovation of latecomer firms is constructed from the theoretical level through the situationalization. The study finds that in the different development stages of disruptive innovation, latecomer firms’ technology innovation and business model innovation form different coupling modes, and through the two-way embedded coupling and interaction of technology, economy and relationship, the coupling effect is gradually enhanced, and then the dual competitive advantage of technology and market is built to break the existing technical paradigm and competitive landscape and achieve leapfrog development.