Abstract: Rapid realization of key core technology breakthroughs is significant for my country to solve the "stuck neck" problem. Innovation remains at the heart of China’s modernization drive. It will strengthen our science and technology to provide strategic support for China’s development. Existing research on how to break through key core technologies only focuses on influencing factors, process, mechanism, mode, and path. There is an insufficient discussion on how latecomer companies can achieve breakthroughs in key core technologies in a short period. Taking HiSilicon as a research object, this paper uses the method of case study and deeply examines the mechanism of rapid breaking through key core technology for latecomer companies. The research results show that: First, introduce the concept of absorption speed, and the rapid realization of key core technology breakthroughs present a dynamic evolution process from improving the absorption speed of external knowledge from individuals, intra-organization, and inter-organization. Second, from the perspective of absorptive capacity and key core technology breakthroughs, our study examines the role and evolution characteristics of complementary assets linking capacity with the increase in the absorption speed. This paper distinguishes generic complementary assets, specialized complementary assets, and cospecialized complementary assets and discusses intra-complementary asset linking capacity, intercomplementary asset linking capacity, and core-complementary linking capacity in the dynamic evolution of absorption speed. It also reveals that core-complementary linking capacity can accelerate technological iteration and upgrades by coupling technology R&D and the internal market. Third, core-complementary linking capacity will increase the absorption speed and support the rapid achievement of key core technology breakthroughs of chip design companies. The study explores the theoretical connotation of absorptive capacity, complementary assets linking capacity, and rapid breakthroughs of key core technology. We provide theoretical and practical enlightenment for the rapid realization of key core technology breakthroughs of chip design enterprises.