"The Keystone Advantage" was presented by M. Iansiti and R. Levien as a strategic pattern of the "business ecosystem" to sustain innovation. However, the concrete construction framework of that strategy is still not fully shown. Therefore, the authors propose unique construction frameworks, based on the keystone strategy that consist of "system theory," "architecture," "standardization," "modified Utterback-Abernathy model," and a "platform" based on the "Project and Program theory." Furthermore, its effectiveness is validated by the case study of photovoltaic power generation business.