Abstract:Abstract: In view of the strategic management problem of how platform-based enterprises can reshape the business ecosystem to maintain their competitive advantage in the period of technology paradigm shift, taking Baidu company as the target, and using the single-case study method, this paper explores the micro-process mechanism of business ecosystem reconstruction under the technology paradigm shift of platform-based enterprises based on resource orchestration theory, and builds the conceptual model. The study finds that: (1) The technological evolution in a specific paradigm drives the iterative optimization of the business ecosystem, while the shift of technological paradigm drives the reconstruction of the business ecosystem. (2) The mechanism of reconstruction is that the platform-based enterprises renews the platform foundation around the reestablished value proposition driven by the technology paradigm shift, and orchestrates resources and creates value, and reconstructs the resource base of the business ecosystem and the value-creating mode of the platform-based enterprises. (3)The sensing capabilities, innovation capabilities and integrative capabilities of the platform-based enterprises support the rebuilding of the business ecosystem. According to the research conclusion, enterprise managers who are undergoing platform transformation should further improve their cognition of the platform and its business ecosystem, while for enterprise managers of already platform-oriented enterprises, they should pay attention to the cultivation of resource orchestration ability, so as to promote the continuous evolution of commercial ecosystem and realize value co-creation among system members.