Third-party open innovation platforms facilitate knowledge/resource exchange, yet their mechanisms for sustaining innovation remain underexplored. Using resource orchestration theory and a case study of ZBJ.com, this study identifies an underlying logic of knowledge construction and evolution, dynamic capability interaction, and ecosystem value realization. Through acquisition, reconfiguration, and sublimation, platforms orchestrate knowledge-centered resources that foster continuous content generation, organizational learning, and technological innovation, which interactions collectively enable ecosystem value creation and sustained innovation. This research extends the application of knowledge management and resource orchestration theory, offering insights into sustainable platform innovation.