Abstract: The rapid advancement of next-generation information technology and digital technology has prompted cross-border collaboration and value co-creation among organizations, and whether core enterprises can shape complementarity in the process of building a digital business ecosystem is critical for enterprises to gain competitive advantage and achieve long-term growth. With regard to Iflyteke's practice of developing digital business ecosystems, this paper comprehensively investigates the establishment of complementary interactions in digital business ecosystems and the construction of their complementary advantages. The research finds that: (1) a process feature can be seen in the complementing building of the digital business ecosystem. Through search and attraction, core enterprises first pick matched eco-partners to enter the ecosystem, and then create connection ties with eco-partners by establishing association structures and deepening linkage relationships. Finally, the key skills of ecological partners end up complimentary through the two-way cycle of value element sharing and feedback element transformation; (2) under the leadership of core enterprises, complementary resources are accumulated around digital technology, stable interdependence relationships are established based on the development and application of digital technology, and finally, complementary resources are used to realize value co-creation, transforming complementary resources around digital technology into values that promote the development of the digital business ecosystem and creating complementary advantages of the digital business ecosystem. The theoretical framework developed in this paper can help to fill a research gap caused by existing studies' lack of consideration of ecosystem complementarity, enrich knowledge of the construction of complementary advantages in digital business ecosystems, and expand research on the construction of digital business ecosystems.

Key words: digital business ecosystem, ecosystem complementarity, complementary advantages, ecosystem construction